All you'd have to do is weld the top section and the funky section together and insert some reinforcement. A little cutting and drilling and you'd be good.
Can't say for sure when I'd be ok to sell the RTT until I have a better grip on when my Columbus will be delivered. It will be easy to swap it over but this unit does not have a mounting track, rather just eight 5/16" bolts through the floor. If they happen to line up with your rack fine, if not we would need to drill more holes. You also will need some aluminum strap to make tabs to catch the mesh like in the photo. I'll probably do "the long way home" with the club. Might be best if you followed me to my place and do the swap there if I know when my RTT will be delivered.
Sounds good to me. I am flexible so whatever is most convenient for you.