I have reconstructed the bad corner , unfortunately I had to take back apart because I did not pay attention to the excat angles. The aluminum would not have lined up right, I saw what I did wrong and the aluminum follows perfectly down the side. I had to guess at how it all fit because all the wood that was there was basically gone and I did not want to pull the good side a part to have a look there. Not being a great carpenter and the fact I hillbilly engineered it does not look factory neat but it is strong as hell and it appears it will work.
I have to cut out the half moon brace that forms the curve in the aluminum than I can insulate and cover it. The good side for whatever reason the bottom frame board on the end is gone so I'm going to try and cut away the bad and fit a new section in there.
I also had the problem of the paint lines, and pattern lining up perfect after I rebuilt my front , and front sides, I had no angles to go by ?, other than the aluminum siding cut ?, so I used that to go by on the corner angles. did the best I could, I think it will live. as for those round parts ?, yeah, as long as you have one good one to use as a pattern ?, your ok. I lucked out on my roof rafters, I had one good one left, I used it for a pattern to cut new rafters. word of caution !, do not use any sheet rock screws to attach any siding !!!. sheet rock screws will corrode aluminum siding, at least it did on mine ?, I then used wood screws made for outdoor weather where ever I attached wood to wood, then stapled the siding to the wood frame. when I attached all my j-rails, I used stainless steel screws.