I probably should have taken more pictures while i was machining this, but whatever. I started out with a giant over sized hunk of aluminum.
marked out the rough size and cut that sucker on the band saw, and trued up the edges on the mill.
Put that sucker on the lathe and bored out the oring sealing surfaces and single pointed the reg threads:
roughed out the top surface:
and the rest of the work was done in one set-up, unfortuantly i didn't take much pictures, but pretty much i roughed out the curved section that meets up with the frame. The outside profile was then milled, HPA and LPA passages well drilled, and lastly the finishing contouring on the curved area. I still need to do all my clean up work as there are a few little rough areas.