Yeah, i've played those before, and they are tough to control.  If you look at the link in my original post, I'm going for the enclosed cockpit design.  There will be a closeable door that will seal off the entire thing, giving it a similar feel to being inside a mech.
I'm talking to some people that have them and I may be able to get specs and dimensions for them.  Then it will just be desining the button placement, rotators, Sound system and multiple LCD controls.  I plan to build it in a style between versions 2.5/3 and the new Pods.  I also plan to incorporate a steering wheel that is modular so racing games can be played.