Brilliant idea!
Do you reckon they would do for 10mm as well?
Yes the would work for 10mm, you might need to make different doors, but they would work well for 10mm. I think they are too small for any larger scale than 15mm, although they might work as the tops of air raid shelters for 20mm. Smaller scales would be fine though...
I considered getting some more to use for 6mm, to use as hangers for some fighters. Haven't done it yet but it is certainly a possiblility.
I would say that