Well you're almost there now, especially with the TBi carb... If you can get the air pump, and the solenoid driver / micro-controller & LCD in one box, that would be a nice compact package with minimal connections to be made... you could also put all the inputs/outputs wires on one multi-pin connector, that would make it that much cleaner, all depends on the model its going in of course... it probably wouldn't be any bigger than a CDi box.