i'm planning an elite costume, for the legs you couls try the following
1. Pep the leg it self(you can get the files at benstreepers topic)
2. Resin the legs
3. put alot of rubber/latex On it
4. carefully take it off
5. from that concept you cane make your stilts
6. if the legs ain,t gonna keep in oplaze, you should try liquid foam. ( i don't really now what it i it calles, it is that styrofomish stuff what comes in a tube)
7. there you go!
Bob