Thanks for all of the great responses......
As for the gear drawing and SolidWorks. I did draw the gear in AutoCad, and I do have it in my solid models, both UG and Inventor. Though it is my general practice to leave that sort of CPU draining detail out of my drawings.
Fear not, for I have built many a turret, and have designed many a spur gear......I have even milled one that was nearly twice that diameter.
The side-to-side design.......
Also not my favorite. We chose it after several prototypes mainly because of it's low profile. A vertical style two-wheeled shooter was becoming to tall, and a one-wheeled design didn't allow for the lowered RPM and increased torque we were looking for in a shooter.
We have tons of adjustability in the design which allows us to tune the wheels for both compression and alignment. To keep both wheels spinning together we've opted to skip any sort of mechanical coupling and just tune the wheels using a tachometer. Worked well for the prototype.