Might I suggest a 135 degree noodle on the left brake line just prior to the caliper to get the line close enough to the chassis to attach it. It looks a bit vulnerable out there.
I know this is an old thread, but looking back through it, I saw Popshot's comment, and I thought that future Street Fox builders might like to know that there's an alternate way to deal with the caliper brake cable problem :
If you pick the right calipers, you'll see, that with a little swapping around of parts, that you can reverse the pull direction 180º.
That takes care of the right caliper, and routes the cable along the steering arm, and right to the handlebar.
Do the same for the left side, only mount the caliper UNDER the arm, and you can route that cable the same way.
No cables waving in the breeze, and it works perfectly - Decent brakes, easy to do, and much neater, IMHO.
Some people can't deal with any asymmetry in something they build, but I think it's worth it in this case.
Anyway, if someone was interested (and likely no one but other Fox builders would be), I can take close-ups of my set up.
chopzone.com
