You need some heat. Measure the outside dimensions of the intake/exhaust sandwich gasket. I forget now what it is, but say its 3X3. You can order a precut piece of 3x3 steel plate, 3/8 or so, maybe 1/2, on ebay. Using the gasket, mark the four holes for drilling, drill the attachment holes.
Use dykum or a sharpie and color up the top of the plate, lay the gasket on, put some bolts to hold the gasket in place and scribe the outside of the gasket and the inside of the gasket. Drill two holes for brass fittings within the inside scribed lines. You will be tapping tap holes for NPT threads. Sort out what size lines to use before you drill these two holes. Fenton use to specify copper lines, so my guess is that ni-copp, which is stronger then regular soft copper tubing, would be ok to use. Compression fittings are fine. Whatever fits the Fentons.
Then cut away the excess on the outside scribe lines. Dress the outside down so it looks pretty. Little paint to match the intake.
Jerry's method is more professional. Mine is completely backyard hacker work, lol.
