I'm back to answer some of the questions that you guys left me. Sorry it took me awhile but I just got back from a road trip on the old 'Cane. 1200 miles in two days...850 the first day and the last 350 today. That's about as much as this body can take but it was fun. But anyways, about the 600rr tail piece everything should mount up easily but the rear seat is going to be a problem. There is going to have to be major fabrications to make this seat support the weight of another rider. I didn't have this problem because I went with a solo tail so I can't be of much help. About the turn signals, I bought an adapter made for a trailer and integrates the break lights with the turn signals. It works pretty slick and makes this really easy. Next, the aluminium brackets can be seen clearly in this picture and trust me...it's nothing fancy.

And lastly it's not that weird to have a the rear brake fluid container exposed but usually you don't realize it. Look at this bike for example.

Good luck and I hope this helps.
-1990 CBR600F Streetfighter
Full D&D, LSL Handlebar Riser Kit, Trail Tech Vapor gauge, F4i tail, Custom paint