ah, didn't think of that indeed.
Should give that a try with blisters, see how that works out
The bases are now covered in plaster and edges have a silicone cover to prevent them from chipping.
They look sturdy enough but if I find outthey're not I'll have to cut them off and replace with MDF nonetheless.
More updates coming up soon.
Did 4 further buildings amongst which a coach house and a raided and barricaded temple as well as the bridge in some previously posted illustration.