I got the replacement brake master cylinder from Van's, so here it is all installed on the passenger's right-side pedal. The cotter pins are in, but all of the hoses are only finger tight until I finish playing with hose routing.
The hose from the brake fluid reservoir to the passenger's left brake tends to want to loosen the right-angle fitting when the pedals move. To solve this, I employed more adel clamps to keep the upper ends of these two hoses aligned with one another. No more problems.
I'm not totally convinced that the little aluminum tee in the above photo is strong enough to support the two hoses, though. I may have to revisit this area…