A couple things off the bat:
1. The fins are very slightly too large to fit in the slots. I'll sand them down with a Dremel.
2. Centering rings are too tight in the BT, I'll have to sand those a little.
3. Coupler is tight on the top tube, which I can ignore since I'm only ejecting the bottom tube for now.
4. I need to cut down the top tube, this thing is absolutely huge. I'll cut it down so the total length is 5 feet-ish.
That's all until Christmas, when I'll start construction when I get a break from school.