This game will live long time - like OFP. There will be more mods to come, and existing ones will grow.
Cities can have lot of gameplay added. Something like merchant assasination mission, but more complicated for example.
So i think some people will find these buildings useful.
I'm still hoping for some more RPG-like gameplay in cities, villages and rural areas, so your improved buildings will definately be of worth there. They are absolutely marvelous!
They remind me of some of the houses/buildings designed by Dutch artist Anton Pieck for the Dutch themepark "de Efteling", which is based on old fairytales. Perhaps you'll find it useful to take a look at some of these:
http://www.krulikovsky.com/efteling/pag.1.html. (note the back and forward buttons in the bottom, they look a bit funny). Especially some of the castles are nice. You'll have to don't mind the music/sounds though

Might give you some inspiration to develop your own buildings as well.
Once again: nice job!