This is an idea for a climber. It was mentioned above about using round tube. We made a few climbing stands our of EMT electrical conduit. It is light and strong. You have to be fairly proficient to weld it because it is thin but it makes a good stand. The next lower size usually slides well into the larger size so it is easy to make the part that goes around the tree and fit it into the seat part, same for the climber. You would have to use something more stout for a ladder stand however. I don't know what the # rating would be on the EMT climber - I was a little lighter then. I don't know if I would trust it now