I picked up some "textured" paint @ michael's yesterday and tested it out on a pice of scrap foamboard and then after it dried i went ahead and primed it black. it gives a great texture (particles aren't too big). it takes a primer well. i haven't tried drybrushing over it, but i think it won't be a problem as the texture looks like it's gonna hold real nice.

on deck for the piece:

• battle damage, wear and tear (bullet holes, blasts, etc)
• finish my crater:
• chop down and un-even the rim, round out the bottom, sand and rubble the outside and glue it to the base.
• sand and rubble the base
• texture the building
• prime and paint