As far as the RCAT switch, you might want to reconsider if you are using a 6V ignition battery. I had one on my 33%er and while letting the motor warm up before the first flight of the day the switch died. Thankfully it decided to give-out while I was just warming up the engine versus just after liftoff or something. I called RCATS and asked if I had hooked it up wrong or something. The tech told me the switch is not made to run on 6V, though the information I got with my switch didn't say that anywhere, and that now-and-then people have problems when doing so. I know people who use them with 6V and have never had a problem, but I decided to go with the optical kill switch from SmartFly. So far, the SmartFly has worked fine.

Dan