New build

I'm looking to build my dream bike no matter if people think it's a dumb idea and was hoping you guys could help me with some specs. It's for a long distance charity ride of about 360 miles with mixed terrain and all of the training coming up to said ride next year

I just purchased this bike and I am hoping I can make all of these parts fit any advice or warnings would be greatly appreciated if possible. Especially surrounding the proposed 650b on the rear. I plan on running no brake in the back.

1. Rockshox Rudy XLPR 1,1/4
2. Shimano alfine 11
3. 650b rims with the fattest and deepest tyres I can fit
4. Any sort of manually operated dropper post
5. Light ergonomic BMX bar
6. Good looking and light pannier rack