Your project seems quite fun but challenging. Most hybrid transmissions don’t have a torque converter, and use the space to package the motor/starter windings. AWD also needs space for a transfer case and additional driveshaft. A conventional powerpack would need to have a place for the starter, which is always located outside the radius of the torque converter. This space is likely used up by other items, including locations for the driveshafts and half shafts. That’s quite a challenge.
The exhaust system has to go through all that space, too, and a turbo needs additional plumbing. After all that, the wiring might be quite easy since there would be less of it and it is not rigid. The good news is that the space where the battery pack was might give extra cargo capacity...if you can get to it.
Actually I was referring to electric cars/hybrids that have no transmission, but rather one motor per wheel, and electronic AWD.
In the case of a sporty car...if the motors could be located “inboard” and connected to the wheel hubs via conventional CV shafts,. the unsprung weight of the motors and brakes could be eliminated.
The easiest would be an existing hybrid with the above configuration, and add the turbo. The turbo may require additional clearance, but lots of the “tuner cars” guys out there have dealt with the limited space issue.
The turbo car would need larger diameter exhaust tubing.than stock.
So such a car with enhanced HP, reduced weight (less battery weight, no transmission, no torque converter, no brake calipers and rotors) would probably be quite the sports car or Autobahn sedan.
It would help if the donor vehicle didn’t look like a roller skate or refrigerator, but instead had some styling, otherwise, the various components could be lifted from junkyard denizen, and engineered into the sexy looking vehicle of your choice.
BTW...have you seen the youtube video where the guy builds a board of mega-caps on a piece of plywood and replaces the battery in his Honda? It repeatedly starts his car. (fact of fiction?)
That’s what made me start thinking about the quick-charge “battery” system.
It seems that since the capacitors (mega-caps) charge almost instantly, some specially crafted circuitry could allow them to slowly discharge into the voltaic cells and charge them back up.
This type of “battery” would make regenerative braking actually work.
(it’s probably already been invented)