A note or two about the sketches...the pins won't just be in four places...they'd have multiple holes so that you could adjust to a variety of angles. Also, the "Single Square filler" would work in conjunction with strips and larger boards to cover the floor area in and around the buildings...that way you don't have to cut holes into bigger boards all the time whenever you want to put a building on a new angle.
Any questions about how I see this working? It makes sense in my head, but I know sometimes something you take for granted other people are missing out on.
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