really impressed with the amount of time you're putting in to this....thought I might throw out a couple of suggestions for future pieces you may wish to construct...do an online (or local) search for "styrene sheet" which is the stuff that model planes are sometimes made of...it is thin and as easy to work as that corrugated cardboard you're using but it allows you to construct precise shapes with an exacto knife or pair of scissors and glues easily with model airplane cement...also, as for neck ring...take a look at subwoofer spacer or mount rings...I am looking at a pair on that big retail site that are made out of mdf with a recessed edge for like $10 bucks...my point being that you sometimes can find dirt cheap items out in the premade world that can save you hours of time...but, that being said, it's great to see your process and follow along on your great build...really great videos