So, I’m a cheap ass, and I would much rather design my own transmitter and receiver than drop $50+ on something I can make for pennies (and time, which I have more of then dollars). I plan on 3d printing the housing, and releasing a custom board schematic, as well as inclusding a housing that will work with off the shelf parts, and possibly doing a small run manufacture (read: maybe just a few dozen, I don’t have my own printer so the run would be small).
I have only touched the gt2b, but I have looked at every controller on the market. My personal opinion is that a wii nunchuck shaped controller (with the joystick limited to only one axis movement) and the two buttons on the front functioning as a cruise control and a second channel for whatever you want is a solid mechanical plan. As for electronics, 2.4ghz seems like hands down the best solution. Maybe also include a couple pots for adjusting sensitivity of the throttle and brake (though, since I will be writing the firmware, I can create custom curves for these anyways).
Anyways, I haven’t actually finished my board, so I don’t have the experience of many of you. I was just hoping to gather any input I can get on design preferences since this is something I would like to provide to the community as a low cost alternative to commercial controllers.