RE: Anyone interested in a custom build
SpikeX
Yes the microprocessor will be connected to the servo and the receiver, and ever other unit in the truck, it is the focal point of the entire embedded control system. The failure rate on an fpga now adays is really low, I've been using them for over 8 years now and I've never had that problem, however if it were to fail the truck would just completely shut off, so I wouldn't expect much damage.
As far as the selling the circuitry, we can always discuss that, sure. In addition if you need any custom digital circuit design for your RCs let me know we'll talk it over and come up with something. I perfer using fpga to implement all of my ASICs in R/Cs, and they are small enough to embed in r/c.