Only two things I'd possibly change is (1) perhaps suggest using an old leather belt instead of rubber... as some people have actually had complaints about the vibrations cutting thru the rubber... plus, they woudn't have to go all the way to Japan to get some thick rubber like you had laying around, and (2) gasoline eats thru teflon tape, so at least suggest the yellow teflon, which is designed for natural gas; gasoline even eats thru the yellow teflon tape, but perhaps not as quickly?
Watched part 1 ...great job. One note...I buy a muffler clamp at the Auto Parts Store for the front mount. Come in just about any size needed, and stronger. I built the front mount so as to raise it up and not have the engine in a bind.