Quote Originally Posted by Triskeliongirl View Post
The new Isis does not have canti bosses on the rear. I was thinking since he is building the fork he can build them in, and I guess I could ask him to add them to the rear when he is doing the s/s stuff.
For the framebuilder to install canti bosses for your rear brake, I believe he'd have to remove paint from the seatstays, braze them on, and have it repainted. He may not be willing to do that, or the expense may be too much. You'll have to ask.

I can't answer your questions about long-reach sidepulls. Maybe someone who has them would know. You might also looks at some used brake calipers of older vintages for different amounts of clearance.