In a different subforum Fossil Fuel Free there is a thread on
Hot-rodding The Toyota MGR. It is about a part that is from Toyota's Hybrid Synergy Drive technology, but from the Toyota Highlander/Lexus SUV instead of the Prius. To begin with, it's like a Prius with a V-6. And it has a separate electric MGR for the rear wheel drive.
Above you see the (3rd) MGR compared to a 36hp VW engine case. It weighs 98lb and puts out 68hp/50N. It will fit in the same space occupied by the VW transaxle. The design goal is a 2WD EV conversion that weighs no more than the original~1800lb. Below, wedged in place with some sticks.
As it turns out, Toyota themselves did a concept car called the Alessandro Volta. It had the V-6, MGR1 and MGR2 in back with MGR3 in front—the reverse of the SUV.
http://www.carstyling.ru/en/car/2004_toyota_alessandro_volta/
I'd be thinking about two of the MGR3 front and rear in a M2A Jeep? For me the problem with hybrids is they don't get away from 'fossil' fuel.