So in the end, the project will be an EV conversion of an ICE car, converting from RWD to AWD at the same time, using production EV drive units, and with body customizations. The overall shape, interior, structure, and complete chassis (suspension, steering, brakes) will be Porsche 981 Cayman (and those are good things
). The Cayman and Speedster are a bit oddball in today's world, having MacPherson strut suspension both front and rear.
With the original style of drive units from the Model S, both front and rear motors will be behind the axle lines. In the front that presumably uses some of the fuel tank space; in the rear it will extend into or under the trunk. That leaves the original engine space as the major opportunity for battery location, which is good from a mass distribution point of view.
Major challenges will presumably be fitting in enough battery, and keeping the rest of the car working with the powertrain replacement.
It should be an interesting project, and nice car to drive.