A-ha, smart thinking with that wood skeleton!
Most of my discoveries, lately, have been just learning how to get the most out of the tools I have to speed up the building process, so I can focus more on ideas. In the last build I posted I pre-made some flooring, walls and roof pieces options, and then just copied them and put them in. Still had some small issues with snapping and gaps, but overall I saved so much time -- and wrist stress!
I haven't really played with prefabs yet, except maybe the creepy statues and big trees from the swamp (for a horror-themed mansion that was gonna be a mini-dungeon -- which never came to be), but that would be a good direction to go in. Open up new possibilities.
And I had checked out your Mausoleum before, I actually was wondering if those pieces were vanilla or a mod... I"d never seen them before.
I'll go check out some videos and that mod you mentioned.
Thanks for sharing!