Yea the welding bill would bealot but same as you I do it myself keep cost down.
That hole looks nasty. Rear seat arch seat back could all be affected.
But keep at it fantastic work is showing.Cheers. i though about keeping part of the arch and weld in bits of a new arch, but might as well weld a whole new arch in. at least i then know its all solid. about 80% of the current arch is in good condition as well, makes it harder for me to cut out
They are so simple to fit that it would be a false economy not to mate