I bought one of these, and the cheaper expansion set as well. You can re-build it because it's all modular. BBTS is the only place I have even found them for sale. I wish I could find like a bootleg version on aliexpress or something.
I have mine currently assembled into a bunch of panels and curved wall segments so I can move them around as needed.
There is a more expensive version with built in lights - but the base version looks pretty easy to install LED's into as it is anyways. I haven't yet tried though.
https://www.bigbadtoystore.com/Product/VariationDetails/65093?o=4