Reply to "Modern Seats?"

Getting a cruise control to actually work in a mid-engine car is tricky. There are none made specifically for such conversions so the magnetic pickup that is intended to be attached to the driveshaft will instead be on a halfshaft. The successful ones reportedly use two magnets rather than one, and they apparently attach easier on stock-size halfshafts rather than the skinnier CV-joint halfshafts. Then you get to interface modern electronics to the primative Lucas wiring in our beloved cars....
As an alternative, have you thought about a hand throttle such as most cars had in the last century?