Sounds like a cool idea.
Can't wait to see a road test video.
Why do you need a drive line?
Wonder how much a custom drive shaft would cost?
An option for speed is to get a MPH app for your phone. I used one for my jeep when i changed tires. Worked well. Has max speed too.
Too weak of fuel pressure is the demise of many a turbo engine. Be careful there.
For driveshaft have you considered a longer one from a junkyard that you could have a shop cut down and weld a new end onto?