Innovator, Looks like you're on to the swingarm. I'd go rigid if I were to attempt it at all which I might someday. I can't find the HD parts site I bookmarked which had some good frames in it but you might do a google for Harley Davidaon frames if you need to research it for any details. It is exellent so far! I'm jealous - not really, but it looks good! - TJ