The reason for investing in this T5 transmission was due to the fact that my first T5 I purchased a while back actually had different gearing in it than what was initially expected. So I decided to get rid of it and wait for a unit that had more favorable gearing and was also decently priced. I also ended up getting rid of the aluminum Ford Racing driveshaft.
My new plan for the driveshaft is to go with a custom Carbon Fiber unit. Main reason is they are lighter, stronger, and safer! They also reduce rotating weight which is a huge bonus in a micro diesel engine car.
The negative is they come at a higher price but all the positives IMO make the extra cost worthwhile.
Here is a link to a carbon fiber driveshaft shop with pricing examples:
Carbon Fiber
GH