Andy you got it more or less, I've already designed the gearbox for coupling the two to a common output, that wasnt the problem. My problem was actually mounting the drill motor without the front gearbox. If you can relay how the best way you found to do this after you try it, it would be greatly appreciated.
My white paper on our gearbox will come eventually, but not untill after 6 weeks
-Rc
-One day, I too will be a moderator on these boards......