Well, one could write a plug-in to translate all those levels and arrays into something a 3d program understands, after all 3d programs do use something similar to store information, it's just that the game and the 3d program speak different languages.
Anyway. I finally got what I wanted more or less. After opening a random lot from the lot catalog (not from a neighborhood like before) in
SimPE and exporting the gmdc as .obj and trying to import it in max -and after disregarding the usual message announcing an inminent crash- I got a brief glimpse of the complete house then max told me it could not take it anymore and that I could try saving before the program closed but the file would probably become corrupted. I accepted the emergency save and when I opened the saved file there was the house except there weren't any more windows or doors.
Thinking I could live with that I tried with my big castle but failed, the program crashed without showing me anything. As it seemed the windows and doors were causing problems, I opened my castle in game, stripped it of everything including stairs, windows, doors, plants, water and terrain elevations and tried again after putting it in the lot catalog, not in a neighborhood. And success! Max crashed at first, but allowed me to save the model. I don't what is causing this initial crash but I¡m working with the house now and I'm not having any problems. Milkshape crashes without trying to save, sadly so I'm as usual thankful to my ancient copy of max 8.
Now, how comes I'm the first one trying to do this? I was sure someone else would have tried to export a house before like with furniture and clothes but it seems it wasn't the case. Making (building?) houses in game is much more fun than making them in a 3d program. I can even say it's horrendously boring trying to use max or milkshape to make houses from scratch. What I'm trying to say is... could someone write a plug-in to export houses? there are tools to export everyting except houses, why? (and I mean why for everything but houses?