Sorry for those pictures. I have to go to a client who for whoom we were creating this models. In the meantime, some of the answers to your questions.
You can not make transparent surfaces. The material itself is a white powder, so if no colors are used, the surface is white. If surface has some color, then during the proces one inkjet cartridge is responsible to color the powder. It works similar to printer. If something sticks out of his "paper space" it wont be modeled. So by carefully placing a model partially outside you can get only a part of it printed. Or you can disect your model in archicad and print it separately (each storey perhaps).
When the printing is finished the model is very easy to break apart, so it has to be sprayed with special solution which hardens the model. You can not cut into it. You can smooth the surface with sandpaper a little bit or you can even color it by hand. The cost should be between 1-2EUR per cubic centimeter of used powder. You can check
http://www.vidar.com/3dprint/ (manufacturer), usa based service company
http://www.alchemymodels.com , and
http://www.ib-procadd.si/tiskalniki/tiskalniki_vidar.htm (Slovenian service company) for some info.
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Gorazd Rajh
From AC 6.5 onward, Ryzen 9 5900HS, 48 GB RAM, RTX 3080, Win 11