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Downsides were:1: 2" foam isn't easy to cut cleanly without making an awful mess.
2: the foam I used (Blue, Dow I think) was not entirely uniform in thickness, so my "flat" surfaces undulated slightly - maybe only +/- 3/16", but enough to matter.
3: it's not practical to mount things like Tortoise motors and circuit boards directly to the foam. I glued small pieces 1/8" plywood to the underside of the foam where I needed to do that.