Very nice ! You should call them
Potemkin Plus because yours are just more then the facade!
. I hope to see them if you take them to San Diego.
A step up in durability (and cost) would be to use Sintra Board. It is like Foam Core, but the foam core is firmer and the facing is sheet plastic, not paper.
https://www.gator-board.com/sintra-board.htm
I ran across a model railroad program that is allows you to assemble and print buildings from photo elements. It actually scaled up to 1/16 pretty well. I figure I could print the files and put a matte laminate over it.