Looks right, Clay!!
Actually, I thought that you needed a longer driveshaft, not a shorter one, or I would have advised you to cut the existing one to the length you need and pin it back together with a piece of brass rod. Either way, it looks good!!
The side benefit of using the aluminum tubing, as you've seen, is that you also get a perfectly round driveshaft, unlike the one in the kit.
Keep up the good work and the posts!!
Later,