The build continues! Today was my first attempt at porting engine cases. I have a Dremel and the associated bits, but I also have a machinist with 25 years experience and a Bridgeport at work, so he gave me a crash course and I got to use that machine as well. I marked out some margins based on a cutout I made of the Airsal 72cc cylinder, and then matched the Treats spacer and the cases. The ports are now smooth but not polished. I can do that later at home. I also dunked the cases in some aluminum acid wash we have at work. They look much better. Vapor honing is next!