I think the reason the final drive is "going the correct way" in a Delorean as opposed to the Lotus, in a Lotus the engine is mounted in front of the transaxle making the car mid-engined (the motor is in front of the rear wheels). That, and the direction of rotation of the motor is what causes the final drive to be spun the "wrong way". Not a problem in a Delorean. Yes, the biggest problem with engine swaps in a Delorean is the very limited choices among transaxles. If you don't use the Renault transaxle about the only other choice is the Porsche and they are not easy to find and are expensive. Newer ones have computers you have to deal with so you need to find an old one. Electric conversions are becoming more and more popular and don't require a transmission. The motor is the cheap part, the batteries and electronics to run it are the expensive part! Because electric cars have such limited range and the batteries are so expensive, (and it takes so long to recharge them) right now hybrid is the way to go so you can charge the batteries as you drive. Dave Delman's car only has a range of 25 miles. Bob Brandies's car has more range but he spent a LOT more on batteries and electronics. I think he also has regenerative braking.
If we add electric conversions to engine swaps maybe we need another thread for that.