Are you doing anything in particular to avoid the "oil-can" wave/wrinkle effect when the summer sun comes around? I've read of people fretting about it, and a few descriptions of efforts to avoid it by pre-heating the metal sheets to expand them slightly before riveting into place. Not having much large-dimension sheet experience myself I'm not sure how big a deal it is. Maybe it's less of a problem for people who do smaller pieces, like simply filling the window holes... but mine is probably going to be something like yours with a near total re-skin of the sides. I won't want any waves/wrinkles showing up in mine!