RE: group plane
The Kadet is a better plane for training purposes. There's also LOTS of trainer ARFS that would work as well and be less $$$ than the Kadet. Nothing against Sig, I love them, I just wouldn't want to spend so much on a trainer that lots of guys would be flying. One good choice would be the new World Models Sky Raider Mach 1...brand new for 70 bucks! Also, if you're part of a Boy Scout troop you might ask a local club to donate their time, field and maybe even a complete trainer setup...Wouldn't hurt to ask, the guys in my club and several other clubs in our area enjoy helping out the Boy Scouts when we can.
Lifelong Boy Scout
WW