Well dang it boy, why the heck are you asking questions, when you already have it figured out?
Well lets see pictures of that also. I just might make me a pair of those to keep in my truck, besides the plastic ones I have already.
You can put the sand in the aluminum tubing also, and it won't kink, if you are making tight turns, but you should be able to bend it without problems, with an electrical tubing bender. You can get em, in 3/4, and 1 inch sizes, at most electrical supply stores. You will have to get a handle for it though.
Ok, uh, say, Steve, ya know, if you have time, and are feeling up to it, could we see some pictures, of you actually making your Snow Shoes? Oh, and the molds also. But no rush, just when you have the time, and are so inclined, we all would really appreciate seeing pictures of them being made step by step.....no not in the snow, I mean, from beginning to finished product. Then you can go step by step, yeah, send pictures of that too.