Slow but steady. Finished the pre-machining of the dummy cilinder head. Before I go to the expensive 60mm (2.5") diameter brass, I test all machining steps on a piece of aluminium.
After turning and saw-cutting away the bulk material, the 0,0-ref point is reamed and a reference plane is milled. A sanity check with a 1:1 scale drawing to see if there is enough material for cnc milling the outside profile, hole patterns and recesses.
Once all processes are checked, the two final heads will be a matter of a few hours.