The rear brake adapter is installed as Surly intended. As for the fenders, I simply used a longer bolt and a spacer to clear the brake assembly. I don't know what brand they are- they look like Planet Bike but they were unmarked in a pick-a-part bin, and the rods are just long enough.

I replaced the Problem Solvers centerlock to 6 bolt adapter for a Shimano adapter on the Alfine 11 hub, and there's no more wobble in the rear disk. I also installed Ergon grips on the Soma Swallow handlebars and they feel much better than the old rubber grips. I also got a 28 tooth chainring in the mail today. I'll see if there's enough room in the dropout to have 2 chainrings without changing the chain length and of course avoiding a chain tensioner.

It's shocking how quiet the Alfine hub is- very little chain noise while pedaling and no clicking freewheel at all. Very stealthy if you don't count the bright orange paint job! I've almost got 100 miles on the Troll so far and I really love it. I can't wait to try it on some trails soon, I've been mostly riding roads and bike paths so far.