To start off I really wish you well with your project, but for me your lacking on your market research.
For starters fleabay is awash with laser cut(forgive me if its cut in some other way) stuff at low prices and due to the easy way this stuff can be made I cannot see you making a fortune out of it. I have a wood working friend who created a simple 15mm building using the
CAD type system within a day(research to prototype to finished building) so its not rocket science.
I wargame with 8 friends weekly and a larger group of about 25 monthly, they all hate laser cut stuff for
FOW.
Your buildings are pre-painted. One of the best things about Dakka is what people do with similar bits of kit and make them their own via a pot of paint and a few bits. Landmark make pre-painted buildings and the biggest complaint is that they come painted, learn the lesson.
Your stuff works well with for say the paving and bridge type stuff as its industrial, accurate and straight line after straight line but for buildings in Europe ? Really ?
Last time I looked there wasn't a straight wall or level window sill in the whole of Europe, let alone a perfect roof.
Your stuff is too perfect. Buildings aren't all about straight lines, its about wonky lines and a thing called a curve(look it up, your buildings are missing it).
I can assure you there is no soul in those flat buildings you produce
Stick to something like Infinity where it suits the game.