I wanted to see how it would look with wheels and fork on, so I got a bit carried away with a late night build.
First I got stuck into the rear brake, as I knew it could be problematic. First I tried threading it through from the calliper. I tried for about half an hour, then gave up. My method was to put a gear cable that I'd threaded through from the front, into the hose, then use that to guide it through. I could get the hose right next to the guide tube in the frame, but couldn't get it to line up well enough to push it through.
So I then did a search around my spare parts to see if I had another spare olive and nozzle so that I cut cut the hose at the calliper end, and thread that through. Luckily I did, so I was able to easily thread the hose through the frame from the front to the back. Luckily I'm running older XT 775 brakes that don't have a banjo at the calliper end. I've no idea how you'd get new XTR or Xts through - I guess you'd need a new banjo?
To prevent hose rattle, I thought I'd use a few stips of the packaging material, taped to the hose:
We'll see how long that lasts!