Ha! I'm building the same kit, I think. I think mine's an AMT boxing, a snap-together kit. If I had to do it over, I'd remove all locating pins and glue the pieces along all mating surfaces instead, to reduce the number of gaps that I had to fill and to deal with the lousy fit. The crew compartment looks OK, but the undercarriage still has some visible but hard-to-reach seams.
I'm also planning on doing a snow base, because it's quick. It'll be Celluclay, with some white glue mixed in, and I use baking soda for snow, once I have the contours finished. I brush on a thin layer of white glue, then sprinkle the soda over it with a spoon. The snow base has the added benefit of correcting the bad stance my kit has, the right foot is not quite level with the left, so the walker can't stand on its own.
I had thought about cutting a piece of foam for the core of the base, then applying Celluclay or putty over it, but I don't have any foam handy right now.
Looking forward to seeing your progress!
