Blackdog: I use a wii remote as my camera and have a 3 point infrared led system that I made and it works flawlessly in other sims. Sure it looks... perhaps less glamorous but it certainly wows people when you show them head tracking for the first time

Plus it was fun putting together. I don't know what you're using for the trackir head mounted portion, but you can make an ir led matrix to put out as much light as the trackir camera does in the first place if you're using a reflective clip. Also, I never realized there was anything contentious about headtracking :p I just disagree with naturalpoint's monopolization of the market and oppression of the DIY crowd.
Untamo: I haven't put anything together. I was thinking a rotary toggle type switch for Flap settings, so it wouldn't be a pot. I like the trim idea though. My main goal is just to move some functions off of the keyboard, less memorization that way

I'm also thinking about making my own rudder pedals and I've also got an Arduino coming that I should be able to hook up to some stepper motors and make physical Altimeter and Airspeed indicators with, assuming we get some data coming out of the game.
Tintifaxl: Great to know!