First of all, I gotta say, what a piece!!!!! Just wow. The fort with 6 blockhouses and two gate walls looks VERY tasty. Oh my.
Re: foam deterioration. I think I've bgt just about every foam piece Ron's made and NEVER had a problem with customer warpage post purchase nor heard anyone complain of same (not to say it hasn't happenned). Adobe walls, churches, bldgs, pirate ships (he actually made two sizes), Fort Ti, Davey Crockett Wilderness set, Tripoli walls and bldgs, War of 1812 stuff, the imcomparable castle and village and all its foam accessories, and, lastly, the new Boonesbporough village and fort have all remained first class products. NO WARPAGE whatsoever that I can see. If the manufacturer releases pieces from mold before they have properly cooled, then warping may occur immediately after the foam is removed from the mold (the warm piece continues to expend, causing distortion.) Some of this problem occurred with the new Davey Crocket Wilderness forts, but appears to have been rectified.My Last of the Mohigans rock looks just great, but the way.
So far as I can see, once pieces have been released fro their original molds with adequate time to cool, you're home free. Little warpage will occur after that.
Dick