Bill,
The Maxon motors are a upgrade sold by Losmandy they bolt straight on. There is also the Stadnard Servo motors sold with the Gemini Kit by Losmandy, these also bolt straight on to the mount.
With third party motors like the Pittmans you would have to create your own adaptation to make it fit your mount. Dan does not sell any bolt on soltuion for thte G-11. Most users make there own for there own mounts. Some users also get there pittmans via Surplus sales or ebay auctions to get them cheaper. But you need to make sure they are suitable for Pittman. The guys on the yahoo group can help you with that.
This is Chuck Shaw's conversion (he is the moderator of the yahoo group)
https://sites.google.com/a/sitechser...-sitech-servos
Chuck is a very nice guy, and helped me quiet a bit with my setup. There are a growing band of G-11 Sitech converts.
Manuals etc have been gathered here, you can also check out members pages to see others people who have converted there systems to Sitech.
http://www.sitechservo.info/
The stepper solution sold by Dynostar and others like the FS-2 (another good stepper) system
http://www.telescope-service.com/FS2/start/FS2.html
come with specific motor kits for your mount that will bolt on.
You can use the Escap motors with the Littlefoot controller, as when i last checked they had not yet released any motor kits. But a little rewiring might be required as the cables sold with the Escap would be for the Dynostar. In my opinion for the price the Littlefoot is the better system in stepper systems.