Plumbing and wiring shouldnt be too hard. What are you doing for engine managment/ecu?
Driveshaft. Its a bit more involved then cutting one off and welding on another half. Keeping it concentric so it doesnt wobble to death, and balancing it after the fact is best left up to a drive shaft shop.
The best way, (see do it once and forget about it) is we would take measurements as required, and give them to a custom driveshaft shop and have them make a shaft specific to the car. It will have the right yokes, proper plung on the output shaft, length, pinion yoke, ballanced, and all new. IRC the cheapest one can be done is around $350 or so, for a steel unit that will hold plenty of power for what you will do with it. Then its a simple bolt in job. The time it would take to cut, fit, weld, machine, ballance, and rebuild joints, you will be %80 to the cost of a new custom shaft, + the confidance its correct.
What is the timeframe you are looking at here? Weres the car located? And Welcome to Shift.