Abrir otro formulario desde plugin

Buenas tardes,

tengo problemas al abrir un segundo formulario, desde el formulario generado por «plugin builder»
talves ya se vio este tema y me puedan ayudar.

asi tambien el plugin builder sólo me permite crear qdialog y dockwidget no puedo crear un Qwidget, en el que me pida usuario contraseña y luego me permita abrir el formulario principal para acceso a la carga de capas?

aqui algunos datos
uso Qgis 3, pyqt5, qtdesinger

este es el codigo

from PyQt5.QtCore import QSettings, QTranslator, qVersion, QCoreApplication
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import QAction
from PyQt5 import QtCore, QtGui
from PyQt5.QtWidgets import QApplication, QWidget, QAbstractItemView
from PyQt5 import QtWidgets
import sys

# Initialize Qt resources from file resources.py
from .resources import *
# Import the code for the dialog
from .eps_bagua_dialog import Eps_BaguaDialog
from .eps_form_2 import Eps_form_2
from .MainGis import Ui_Form

import os.path

class Eps_Bagua:
    """QGIS Plugin Implementation."""

    def __init__(self, iface):
        """Constructor.

        :param iface: An interface instance that will be passed to this class
            which provides the hook by which you can manipulate the QGIS
            application at run time.
        :type iface: QgsInterface
        """
        # Save reference to the QGIS interface
        self.iface = iface
        # initialize plugin directory
        self.plugin_dir = os.path.dirname(__file__)
        # initialize locale
        locale = QSettings().value('locale/userLocale')[0:2]
        locale_path = os.path.join(
            self.plugin_dir,
            'i18n',
            'Eps_Bagua_{}.qm'.format(locale))

        if os.path.exists(locale_path):
            self.translator = QTranslator()
            self.translator.load(locale_path)

            if qVersion() > '4.3.3':
                QCoreApplication.installTranslator(self.translator)

        # Create the dialog (after translation) and keep reference
        self.dlg = Eps_BaguaDialog()

        # Declare instance attributes
        self.actions = []
        self.menu = self.tr(u'&Eps Bagua')
        # TODO: We are going to let the user set this up in a future iteration
        self.toolbar = self.iface.addToolBar(u'Eps_Bagua')
        self.toolbar.setObjectName(u'Eps_Bagua')
        
        self.dlg.b_cerrar.clicked.connect(self.bcerrar)
        self.dlg.b_aceptar.clicked.connect(self.baceptar)
        
    # noinspection PyMethodMayBeStatic
    
    def baceptar(self):
        flas = QtCore.Qt.WindowFlags()
        flas = QtCore.Qt.WindowStaysOnTopHint
        flas |=  QtCore.Qt.WindowMinimizeButtonHint  
        app = QtWidgets.QApplication(sys.argv)
        application = Eps_form_2()
        application.setWindowFlags(flas)
        application.show()
        sys.exit(app.exec_()) 
    def bcerrar(self):
        self.dlg.close()
    def tr(self, message):
        """Get the translation for a string using Qt translation API.

        We implement this ourselves since we do not inherit QObject.

        :param message: String for translation.
        :type message: str, QString

        :returns: Translated version of message.
        :rtype: QString
        """
        # noinspection PyTypeChecker,PyArgumentList,PyCallByClass
        return QCoreApplication.translate('Eps_Bagua', message)
    def add_action(
        self,
        icon_path,
        text,
        callback,
        enabled_flag=True,
        add_to_menu=True,
        add_to_toolbar=True,
        status_tip=None,
        whats_this=None,
        parent=None):
        """Add a toolbar icon to the toolbar.

        :param icon_path: Path to the icon for this action. Can be a resource
            path (e.g. ':/plugins/foo/bar.png') or a normal file system path.
        :type icon_path: str

        :param text: Text that should be shown in menu items for this action.
        :type text: str

        :param callback: Function to be called when the action is triggered.
        :type callback: function

        :param enabled_flag: A flag indicating if the action should be enabled
            by default. Defaults to True.
        :type enabled_flag: bool

        :param add_to_menu: Flag indicating whether the action should also
            be added to the menu. Defaults to True.
        :type add_to_menu: bool

        :param add_to_toolbar: Flag indicating whether the action should also
            be added to the toolbar. Defaults to True.
        :type add_to_toolbar: bool

        :param status_tip: Optional text to show in a popup when mouse pointer
            hovers over the action.
        :type status_tip: str

        :param parent: Parent widget for the new action. Defaults None.
        :type parent: QWidget

        :param whats_this: Optional text to show in the status bar when the
            mouse pointer hovers over the action.

        :returns: The action that was created. Note that the action is also
            added to self.actions list.
        :rtype: QAction
        """

        icon = QIcon(icon_path)
        action = QAction(icon, text, parent)
        action.triggered.connect(callback)
        action.setEnabled(enabled_flag)

        if status_tip is not None:
            action.setStatusTip(status_tip)

        if whats_this is not None:
            action.setWhatsThis(whats_this)

        if add_to_toolbar:
            self.toolbar.addAction(action)

        if add_to_menu:
            self.iface.addPluginToMenu(
                self.menu,
                action)

        self.actions.append(action)

        return action
    def initGui(self):
        """Create the menu entries and toolbar icons inside the QGIS GUI."""

        icon_path = ':/plugins/eps_bagua/icon.png'
        self.add_action(
            icon_path,
            text=self.tr(u'abrir eps bagua'),
            callback=self.run,
            parent=self.iface.mainWindow())
    def unload(self):
        """Removes the plugin menu item and icon from QGIS GUI."""
        for action in self.actions:
            self.iface.removePluginMenu(
                self.tr(u'&Eps Bagua'),
                action)
            self.iface.removeToolBarIcon(action)
        # remove the toolbar
        del self.toolbar
    def run(self):
        """Run method that performs all the real work"""
        # show the dialog
        self.dlg.show()
        # Run the dialog event loop
        result = self.dlg.exec_()
        # See if OK was pressed
        if result:
            # Do something useful here - delete the line containing pass and
            # substitute with your code.
            pass
class Eps_form_2:
    """QGIS Plugin Implementation."""
    def __init__(self):
        # Create the dialog (after translation) and keep reference       
        self.ui = Eps_form_2()
        self.ui.b_cerrar.clicked.connect(self.bcerrar)       
    # noinspection PyMethodMayBeStatic   
    def bcerrar(self):
        self.ui.close()
    

el error señala lo siguiente

RecursionError: maximum recursion depth exceeded while calling a Python object
Traceback (most recent call last):
File «C:/Users/Angel/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\eps_bagua\eps_bagua.py», line 70, in baceptar
application = Eps_form_2()
File «C:/Users/Angel/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\eps_bagua\eps_bagua.py», line 194, in __init__
self.ui = Eps_form_2()
File «C:/Users/Angel/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\eps_bagua\eps_bagua.py», line 194, in __init__
self.ui = Eps_form_2()
File «C:/Users/Angel/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\eps_bagua\eps_bagua.py», line 194, in __init__
self.ui = Eps_form_2()
[Previous line repeated 369 more times]
RecursionError: maximum recursion depth exceeded while calling a Python object