Another productive session this afternoon saw the parts above detailed ready to fit.
Although I have the Milling machine and a rotary table for it, I kept my Proxxon mini Pillar drill and dividing head which I use for drilling out the small stuff.This is the set up when I lift it onto the bench.

This is partway through drilling out the valve guides

Once drilled I did my usual trick of wire and microbore tube filed to a hex for the head. I also fitted the rather nice brass cylinder relief valves that came with the kit.