Remote master cylinder reservoir
I decided to keep the interior simple and found some '98 Mustang seats. In checking out the fit I found that the master cylinder reservoir, which sticks up 4 " above the floor pan, will be right in the middle of the seat frame / track. (Oh yeah, that's why I was going to build a bench seat.)
So here's the remote master cylinder "kit." I found some 2 x 4, 1/4" wall aluminum (6061) box tube. I had a Willwood master left from another project that had a screw on cap and seal. I made a couple bungs to fit the cap, cut the box tube 11" long, milled a slot in the middle so I can weld in a plate to create 2 cavities. I also copied the original reservoir attachments to make adapters to accept 1/4 npt fittings. The short piece of box on the right was a test weld - doesn't look too goo, but it holds water.
It will mount under the bed lid, next to the gas tank and in the only place I could find that would allow access to fill it. (Sorry about the blurry pic.)