I am starting a project that I would like to make a custom radio transmitter for. I was at ConExpo a few weeks back and noticed a couple R/C skid steers (Bobcat had one, and some other company). I noticed that their transmitter was suspended from a strap and it looked like it was all contained in a electrical 'project' type box. Are there any 'kits' or the like to make a transmitter? I am imagining being able to have different kinds of input devices plug into the actual transmitter similar to how a servo or speed control plugs into a receiver.