I couldn't get the quote function to work, so
OP said "These were not done with a measuring tool, so I know some of the dimensions are wonky and somehow I managed to give a good slant to the back of the cylinder and not notice until about now. LOL. Oooops. Among other issues. Handle seems a bit off and tapered barrels are not easy to draw. hehehehe"

Looks to me like your Mark I Mod 0 eyeball is a pretty good measuring device - keep it up!