MR2, good idea for starting point; my only worry is the mid-engine layout in that very small chassis probably wouldn't handle the traction battery very well. The MR2 has a fairly difficult access to the power train too. The materials quality would have to be upgraded to Prime Advanced level. One thing I did forget in my new Prime Sports, is the addition of noise-cancelling technology, instead of soundproofing. This would tremendously reduce the weight of the car, while still keeping it very quiet. .
Rumour has it that the Supra (in collaboration with BMW) may offer a hybrid powertrain. But it may be the multisport hybrid HSD from the LC500h rather than the Prius type HSD.