To reply to the first question of pacific996, it's not a geared down motor. It's a motor with similar torque than the original 996. It has approx 400Nm of torque. and 170KW of peak power. I'm using the original transmission to have the same torque at the wheels.
For the other questions from Tutashen:
Yes it's tac welded in place. I'll leave the full welds to a professional that has a TIG to do a perfect job. These welds are so important.
For the batteries, i'll be using lithium so not so much weight and volume. Like you said part of the trunk will be used for batteries but just half. For me the most important wast that the car remained a four seater. The remaning of the batteries will be in the motor compartiment and maybe a little were the gas tank used to be.
For your last question about the torque of the motor:
Take a look at the video on this page of my blog, it's the FEM analysis of the deformation of the support (scaled to be seen on the vid):
porschestrom: FEM Analysis
The support I made doesn't take the torque of the motor, it actually takes the torque of the wheels. Only the thick aluminium plate takes the torque of the motor.
Thanks for you interest!
Cheers.