Here are the buildings I've just finished for the game. Like most of my buildings they are built as modules each mostly 12cm x 6cm with a few 6cm square.
Construction is foamcore with Wills pantile tiles for the roofs. I started with the very basic rectangular buildings but I really prefer the second wave where I split the building 1:2 as they look far less monolithic
The next step is to try and create some scenic village bases to place these on. Typically I'll place 3/4 buildings in each location.