Great write-up and photos.
One suggestion: when you're pushing the piston(s) back, bleed the brake fluid into a brake bleeding tool. Ideally, brake fluid should always move through the master out to the slaves, and not back into the master (also, if your reservoir is full, you risk over flowing it if you're pushing a lot of fluid back.) This prevents any contaminants from damaging the master. When finished, use the bleeding tool to bleed some fluid and any air from the slave.