Yes, we've seen your brother around.
It seems like a local Burner would be best qualified to help you tinker with your chair. Best to find your regional contacts, show up to some regional events and be awesome, meet some camps, be sure to lead with any talents that you have. Meet some theme camps. Keep in mind that theme camps don't typically have a goal of supporting virgins so much as providing an experience to the city at large, and being composed of people who will help with that financially, logistically, and physically. If physically you have some compromises, maybe your skills will be organizational or in brainstorming for fundraisers, or . . . ? Who knows.
You've probably seen this link by now, it's a good place to start (there's an email address at the bottom where you might be able to ask questions):
Wheelchairs on the Playahttp://www.burningman.com/preparation/e ... hair.html#
Vehicles for People with Disabilitieshttp://www.burningman.com/on_the_playa/ ... enses.html
Welcome to the board . . .