The brakes and clutch use a common dual-outlet reservoir, which I kind of like. The front/rear brake circuits need to be plumbed into one of the outlets with a T or Y adapter, the clutch master cylinder requires a 7/16" to barb adapter and plumbs into the other reservoir outlet.
I've chosen to plumb the brakes to the side of the reservoir where the fluid level sensor is located. I also decided that I wasn't happy with the routing required by the use of the GBS supplied 'Y' fitting so I bought a 5/16" nylon T fitting at OSH.
Presently waiting for a proportioning valve to arrive before I commit to remaking the rear brake line. More on that later.
It's not easy finding a 7/16" UNF to 5/16" barb fitting, GBS supplied one in the inventory of parts for my car but I've misplaced it. I sourced a replacement from Pegasus Racing. They also have a banjo style fitting that I may swap to if the vertical fitting doesn't work as well as I would like. (I don't think that'll be a problem, however.)
The differential is a 3.6:1 LSD from a Ford Sierra, it fits in the chassis well enough but I'm going to need to fabricate some spacers. The mounts on the diff case are 7" wide, the chassis brackets are 8.25" wide. This means I'm going to need 15.5-16mm spacers to center it up in the chassis mount. I'm going to see if I can get away with printing them in ASA with 100% infill.