Macro Corner shapes wizard

This macro is a complete application, it pops up a dialog asking for the dimensions of your corner piece, then creates the object in the document and creates a page view with top, front and lateral views of the piece.
There is a modified version with changes GUI.

# -*- coding:utf-8 -*-
 
#####################################
# Importation de fonctions externes :
 
#from os import *
import FreeCAD, FreeCADGui, Part, Draft, math, MeshPart, Mesh, Drawing
from PyQt4 import QtGui,QtCore
from FreeCAD import Base
App=FreeCAD
Gui=FreeCADGui
 
##################################
# Défnition Class :
 
class Corniere:
   def __init__(self, obj):
      obj.addProperty("App::PropertyLength","L1","Corniere","Largeur 1").L1=20.0
      obj.addProperty("App::PropertyLength","L2","Corniere","Largeur 2").L2=20.0
      obj.addProperty("App::PropertyLength","e1","Corniere","Epaisseur 1").e1=2.0
      #obj.addProperty("App::PropertyLength","e2","Corniere","Epaisseur 2").e2=2.0
      obj.addProperty("App::PropertyLength","Longueur","Corniere","Longueur").Longueur=200.0
      obj.Proxy = self
 
   def execute(self, fp):
      P1=Base.Vector(fp.e1,fp.e1,0)
      S1=Part.makeBox(fp.L1,fp.L2,fp.Longueur)
      S2=Part.makeBox(fp.L1-fp.e1,fp.L2-fp.e1,fp.Longueur,P1)
      fp.Shape=S1.cut(S2)   
 
##################################
# Défnition locale de fonctions :
 
 
def proceed():
   QtGui.qApp.setOverrideCursor(QtCore.Qt.WaitCursor)
 
   if FreeCAD.ActiveDocument==None:
      FreeCAD.newDocument("Corniere")
 
   oldDocumentObjects=App.ActiveDocument.Objects
 
   try:
      QL1 = float(l1.text())   
      QL2 = float(l2.text())
      Qe = float(l3.text())
      QLongueur = float(l4.text())
   except:
      FreeCAD.Console.PrintError("Wrong input! Only numbers allowed...\n")
 
   Cor=FreeCAD.ActiveDocument.addObject("Part::FeaturePython","Corniere")
   Corniere(Cor)
   Cor.ViewObject.Proxy=0
   Cor.L1=QL1
   Cor.L2=QL2
   Cor.e1=Qe
   Cor.Longueur=QLongueur
 
   App.ActiveDocument.recompute()
   Gui.SendMsgToActiveView("ViewFit")
 
   QtGui.qApp.restoreOverrideCursor()
 
   Plan(Cor)
 
   dialog.hide()
 
def hide():
 
   dialog.hide()
 
def Plan(obj):
 
   ObjetProjete=obj.Shape
 
   TailleX=ObjetProjete.BoundBox.XLength
   TailleY=ObjetProjete.BoundBox.YLength
   TailleZ=ObjetProjete.BoundBox.ZLength
 
   page = App.activeDocument().addObject('Drawing::FeaturePage','Page')
   page.Template = App.getResourceDir()+'Mod/Drawing/Templates/A3_Landscape.svg'   
   vueprofil = App.activeDocument().addObject('Drawing::FeatureViewPart','VueProfil')
   vueprofil.Source = obj
   vueprofil.Direction = (0.0,0.0,1.0)
   vueprofil.Scale = 1.0
   vueprofil.X = 50.0
   vueprofil.Y = 50.0
   page.addObject(vueprofil)
 
   vuegauche = App.activeDocument().addObject('Drawing::FeatureViewPart','Vuegauche')
   vuegauche.Source = obj
   vuegauche.Direction = (-1.0,0.0,0.0)
   vuegauche.ShowHiddenLines = True
   vuegauche.Scale = 1.0
   vuegauche.Rotation = 180.0
   vuegauche.X = 50.0+TailleX/2+TailleX
   vuegauche.Y = 50.0
   page.addObject(vuegauche)
 
   vuedessus = App.activeDocument().addObject('Drawing::FeatureViewPart','Vuedessus')
   vuedessus.Source = obj
   vuedessus.Direction = (0.0,-1.0,0.0)
   vuedessus.ShowHiddenLines = True
   vuedessus.Scale = 1.0
   vuedessus.Rotation = 180.0
   vuedessus.X = 50.0+TailleX/2+TailleX
   vuedessus.Y = 50.0+TailleX/2+TailleY+TailleX
   page.addObject(vuedessus)
 
   vueiso = App.activeDocument().addObject('Drawing::FeatureViewPart','VueIso')
   vueiso.Source = obj
   vueiso.Direction = (-1.0,-1.0,0.5)
   vueiso.Scale = 1.0
   vueiso.ShowSmoothLines = True
   vueiso.X = TailleZ+TailleX/2
   vueiso.Y = 7*TailleZ+3*TailleY
   page.addObject(vueiso)
 
 
   App.activeDocument().recompute()
 
   PageFile = open(page.PageResult,'r')
   OutFile = open('temp.svg','w')
   OutFile.write(PageFile.read())
   del OutFile,PageFile
 
 
dialog = QtGui.QDialog()
dialog.resize(200,200)
dialog.setWindowTitle("Corniere")
la = QtGui.QVBoxLayout(dialog)
 
e1 = QtGui.QLabel("Dimensions de la corniere")
commentFont=QtGui.QFont("Arial",10,True)
e1.setFont(commentFont)
la.addWidget(e1)
 
t1 = QtGui.QLabel("L1")
la.addWidget(t1)
l1 = QtGui.QLineEdit()
l1.setText("20")
la.addWidget(l1)
 
t2 = QtGui.QLabel("L2")
la.addWidget(t2)
l2 = QtGui.QLineEdit()
l2.setText("20")
la.addWidget(l2)
 
t3 = QtGui.QLabel("e")
la.addWidget(t3)
l3 = QtGui.QLineEdit()
l3.setText("2")
la.addWidget(l3)
 
t4 = QtGui.QLabel("Longueur")
la.addWidget(t4)
l4 = QtGui.QLineEdit()
l4.setText("300")
la.addWidget(l4)
 
okbox = QtGui.QDialogButtonBox(dialog)
okbox.setOrientation(QtCore.Qt.Horizontal)
okbox.setStandardButtons(QtGui.QDialogButtonBox.Cancel