So laser cut MDF or card for the buildings? Interesting departure. Too much time spent with WG.
The previous Italeri 1/72 buildings all work with 28mm, I have most of them. Some judicious build ups or enlargements to doorways helps. It's about the only thing that is noticeable. By the by the Warlord games ruined building sold for 28mm is actually the Italeri 1/72 kit re-boxed.
Of course these are a new departure so anyone's guess as to whether they will work.