I've been working on KMX trikes for a good year or so now and I've stirred up enough interest to start a business out of it. I'm working with Matt (recumpence on ES) who is helping me build the RC drivetrain, Dave (KMX owner), and Travis (EV components) to put together some awesome Lithium-powered RC Trikes. All of the info you would want to know is on my website: http://www.FFRtrikes.com
These little rigs have been a fascination of mine for a while now and hopefully some others will also be interested. Let me know if you have any questions!