Mike:
I am using CNC master cylinders 5/8 front and 3/4 rears on mine. They have a cap on the top of the reservoir body for filling. These are all mounted to the standard brake balance bar set up. I fabricated an aluminum plate to place over a cutout in the floor to access for filling. All I do is unsnapp the carpet, turn four Dzus fasteners and access the cylinders.
I am not using a residual pressure valve with my system and it works great. I am using jag rears and dodge dart front calipers. If you need a 2lb valave let me know, I have a brand new valve I anticipated having to use but I wont need it. Its yours if you send your address
Regards,
Pete Chifo, Jr.