The most performance comes from timings, those are the moments when ports and crankshaft opens and closes. These are pretty sure CNC milled. Also many cuts and scoops are just CNC work. Afterwork by hand is only to smoothen out the angles and sometimes matching the sleeve with the crankcase but I am pretty sure the Ielasi engines from the shop have no handwork.

Pics of hand modifying is just what most people want to see but do you think the many hundreds of engines he has sold are done by hand?