There's another thread on here
http://www.chiefdelphi.com/forums/sh...threadid=33082
In it is a video of team 121 documenting there progress. They apparently didn't mind showing there concepts to the world. So I doubt they would mind you taking the liberty of the concept shown. You should probably ask anyway. But personally I think the wood 2 joint arm mock-up concept is a great idea, and could be built pretty easily. It's my opinion to stay away from elevators. I think they're too slow and top heavy. What ever you do, keep your center of gravity low. There's threads on telescoping arms, which could be a great easy way to go also.
All that said, if you're feeling like an arm may be more than you're ready to build. There are some excellent defensive strategies that you could design to, that let you place tetras inside of goals instead of on top, and focus more on a good drive system to block and offend. Every alliance will need a good bully. It's also my opinion that the kit is so good, this year it may boil down to the best drivers, and not the equipment. Every year has shown you can do a LOT with nothing more than a rolling chassis, and this year will be no different. I would focus more on getting done quick and giving your drivers as much time as possible to get used to it.