I checked again, shogakusha. The foundations are indeed from Exiles Architect. There are two kinds of scaffolding foundations. I chose the narrow flat wood. And the other building parts are from Northern Timber. I finished with some DLC grid fences from Riders of Hyboria, and for the final build there should be glass parts and larger windows additionally to the open sloped walls. So all in all the room will later get more light flooded. =)

The only downside with the glass parts so far is, that those windows have a frame which sometimes shows through the other overlapping walls. I hope there will be frameless window parts in the future. So one can overlap glass whereever they like. It will be awesome! =)

Yes, it's LBPR. =)
Well, there ARE indeed foundations, so no extra support needed. ;)
Those scaffold-like foundations are from Exiles Architect, I think.

Neat design! I like the overlapped sloped walls. I assume LBPR? What are you using to provide foundation support?