Since the fediverse bridge wasn't behaving, I made a Lemmy account. Here's Part One
Ultimately it all came from here: https://www.multiboard.io/parts-library
Some specific ones I used include:
Tiles (20 6x6): https://thangs.com/search/%22Multiboard1%22%20creator%3A%22Keep%20Making%22?scope=thangs&view=list
Offset snaps (I used 8mm, which is deprecated):
A - https://thangs.com/search/%22MB18%22%20creator%3A%22Keep%20Making%22?scope=thangs&view=list
B - https://thangs.com/designer/Multiboard/3d-model/Snap%20%28DS%20Part%20B%29-1323061
Hooks: https://thangs.com/search/%22MB180%22%20creator%3A%22Keep%20Making%22?scope=thangs&view=list
Pegs: https://thangs.com/search/%22MB182%22%20creator%3A%22Keep%20Making%22?scope=thangs&view=list
Locking bolt: https://thangs.com/designer/Multiboard/3d-model/Locking%20T-Bolt-1310062
Snaps: https://thangs.com/designer/Multiboard/3d-model/Moderate%20Weight-Bearing%20Snap-1311034
Wherever you want to use the mounting offset snaps, you'd use a friction fit.
Hm, gonna be a two parter.