My frame is steel, but pinned together. The sleeves and rails are NOT a close fit. Consider that when you pull the frame to your D-rings with straps, and top off the boat, all those pin connections get super tight...there's no rattling.
Also remember that things do move and what may be a precision fit in your shop may not align when you go to put it together at a remote airstrip after you've invested significant vacation time and logistics money to get there.
Keep it Simple, Stupid!
Originally Posted by BGillespie
How long are the pieces you are joining and can they be transported from where you are storing them? If they're short enough to fit in a small engine lathe and can be transported, my friends and I like beer. If not, I have a tubing sander.