Don;
Those are some impressive engines and I like the sample cut instructions. Did you ever build from his plans? When I get caught up (if ever), I'd love to give one of those a shot. I remember the engine Swede (homegunsmith) posted on his website. Damn impressive. I think he also built a jet at one time. I'm 63, getting ready to retire in a year or so then into the toy factory for the duration.
Hope your feeling better these days and keep us posted.