Meanwhile, I've been contemplating some shop kits. These are based on several to be found in Truro.
The main front is 3mm ply, laser cut. The design gives a small vestibule to a side entrance, alongside a large opening for the main shop, and two smaller windows on the upper floor.
I'll add Silhouette-cut windows & door, plus the stonework around the door entrance, but leave the main shop door/window to the buyer's own choice.