Hi Mauro,
It sounds like you're trying to over simplify your model to the point any data would not be particularly useful.
You should probably be able to access a DXF/DWG file for any aluminium framing system you have, which can be imported as an underlay and traced over, keeping in mind that you cannot draw a enclosed cavity as one piece (but you can draw it as two pieces, I.e. a RHS could be drawn as two channels)
If this is in a DWG file open it in autocad and export it as a earlier DXF file.
It also sounds like you're importing the glazing incorrectly, The entire DGU should be modeled in Window, then imported to therm.
Also keep in mind that the DGU spacer will have a large impact so an approximation of the spacer will also be required.
If you've been in the facade industry for a while you should already have access to some therm reports to give you a good idea on how to model your system.
If you haven't, you should probably wait until you've completed a few jobs and have a few reports others have completed so that you have at least some idea if the results you are getting are reasonable.
I've attached an example of the model complexity that would be expected if you're planning to use your models to justify ESD performance.
Finally read the therm manual which clearly states that the glass should be orientated up and down the page (Not across), you define the section as a sill/jamb/head etc, and change the gravity vector to account for real life orientation.
Regards,
Angus.