there is a packing foam that is black or grey, is very spongy. it compresses well and is molded into support by the model itself, but pushes out for years. I am thinking of doing that with any large models [[[ vector stargazer]]]]] and see what happens. the recent findings I have made is that the ideal size for a standard card stock model [such as those colored reams at staples. I believe its around 60 lb.] is about 18 inches long maximum. making a duplicate bw page, trimming it undersize slightly is really good support for anything 18''-20'', and then for the really big stuff cardboard supports made just for that particular model, foam board or actual sponge material. if you are going with a 4 footer or bigger, you will want plastic jars or cans, balloons-believe it or not, Styrofoam pillars, forms etc, or wood supports cut to shape
light leaks are the main problem, if you are avoiding paint, black rubber weather foam works good.
I will send those now Zath!