Charlie-
Adding 360 and 270 wheels is a great idea- they're some of the only widely-used controllers we don't have much option on, thus far. If a BYOAC'er wants a 360 wheel, it's used on ebay or expensive from Happ. For 270, you've got the same options, plus cheap-o PC wheels. You'd have the market cornered on steering controls, and let the joystick & encoder guys fight amongst themselves!

I think you should give the swapable idea some further thought, too. There's gotta be a way to pull this off, and I have to believe there are more potential customers who would pay extra for a 3-in-one than there are that would buy 3 separate steering controllers.
For that matter, folks wouldn't necessarily have to shell out the big bucks for a 3-in-one, as you could sell single-function "base models", and then "upgrade kits" they could add down the line. And you know they'd come back and buy them, too. If I wanted steering controls but was on a budget, and I knew your system was upgradable, I'd buy a 360 unit for starters (lower cost than the yoke, more/better games than the 270), then add the 270 and yoke upgrades later when my budget allowed. And I'd definately buy your system instead of ebay/happ/pc stuff, BECAUSE it was upgradable.
Let's see, the yoke/270 is easy, since that's just a swap, Steering Wheel (Handlebars? Spy-Hunter style?) for the yoke-top. It's the 360 that's tough, you'd need to suddenly allow the yoke base to spin freely, and disengage the pot, and add an encoder & optics. Tough order, that.
Maybe if you made a totally separate 360 unit that was contained in the same housing as your current yoke top(y-axis). Then make that unit such that it could be mounted directly to a CP, for standalone use, but also make it such that it would attach to your current base(x-axis). Add a locking mechanism to the base/x-axis, so it won't turn when the 360 module is installed, and you've got it.
If you actually build this, I want a discount.
