Creating an inner temple is something I plan on working on for the liminal magick challenge! We’re on the same page 
I don’t have any experience creating an inner temple right now because I haven’t done it yet. I’ve thought about creating a visualization using The Sims 4 (because the building tools are really helpful) and then letting my brain explore that, if that makes sense.
There’s also a process of trancework that lets your brain come up with its own sort of temple. You go into a meditation or trance with the intent of finding your temple rather than building it.
Good luck on your temple creations! If I find any answers to your questions from my personal experience I’ll be sure to come back and let you know