I understand this is Alpha and it could be that you're not done with adding assets, but as this was also the case with retail Arma 2 it makes me worry you're not going to do it again for Arma 3, which would be a huge shame.
While I'm mainly asking here for the larger, enterable structures. It would also be nice for all the small doodads like walls, telephone poles, electricity pylons, communication towers, building ruins and wrecks among other things. Give us the whole sha-bang and let us shock you with what we come out with!
(see the mods listed above)