If I get the money I am going to do a lot of research before building an electric or a hybrid, but I think that the best bet for the money is to buy your choice of used vehicle. The first hybrid that I read of was a small Subaru pickup truck. It got about 75 mph but only did about 45 mph. Who knows what someone could have done? What I still haven't worked out is whether there is a viable scheme using three-phase 10 horsepower motors, and I don't even know if 10 hp three-phase is the same as 10 hp DC. Someone out there is putting 6v, 1000 amps through a DC motor and getting 90 mph on a VW Rabbit. That kit is something like $10,000 and most of that is the motor. A three-phase 10 hp motor is about $500. This might also make a good case for keeping the old transmission, which would make a lower torque motor more usable. You can replace half a dozen transmissions for $10,000.