I admire your dedication.
Regarding the RB kit, as a previous RB 4046 user, I feel I gotta chime in. My combo was RB calipers + 300mm RB one-piece rotors + ET500. I don't know which brake pads you plan to use, but my experience is that ET500 can become too hot and lose 100% braking power right after an emergency stop. The larger rotors you have will help, but I will avoid RB brake pads because of the potential danger.
RB calipers/rotors are prone to noise. I had success using Centric Posi-quiet Metallic that keeps the noise to a very reasonable level. This brake pads have softer initial bite but have reassuring braking power, and most importantly do not fade during my ownership of RB calipers.
Overall, I like the calipers and if not for uneven wear issue, I would stick with them. After using Stoptech ST-41, I feel RB does not feel as stiff. The travel on Stoptech feels more like stock calipers, just with more consistent feedback deep into the travel, while RB is very short.
As for BBK, one thing the XLR8 BBK did not work well on my car was the front can lock up more easily especially when braking over bumpy roads. I don't know if that was due to more braking force from the BBK, or simply the extra weight on the 1-piece rotors making my suspension inadequate.
BTW, I have a set of Carbontech Bobcat for 4046 on my shelf that I did not get to use. If you want, I can sell them to you for cheap.