🪓👕This is a bit late but why would you not chop the rear window ? that window is so big you can drive a truck through it . I'm sorry but your going to do how many welds ? I know I have seen other people do that , you can save a days work by doing one cut on each side V / up to the end of the radius of the roof then cut along towards the front a but 6" to 8" then cut across the roof , with a Radius in the corners , then all you need is One 4mm strip to go across and 2 small 4mm strips for the sides , That's 2 welds across the roof