Slowly making my way through the entire site...
That is some really excellent work, Rodger.
I have never tried anything of this scale. The closest would be a functioning two piece two story doll house for my daughter, last year for her birthday. About 4 feet by 4 feet and 3.5 feet at at the roofs peak. Made complete with sticky floor tile squares and carpet and shingled roof and each room a different color, and even a generic staircase to connect up and downstairs. It was made entirely from scrap wood and half sheets of plywood found around the house and garage (maybe $45 in molding that was meant for another project in the basement was the only actual expense).
She loves it and plays with it everyday we are at home.
Now she swears she needs a deck and probably a 4 car garage to go with it for all her cars and vans and motorcycles and bicycles...
It never ends....