Maybe I’ll keep hunting. But two classic car ‘specialists’ I found said the door metal is so thin for the large area it covers that it’s tough to weld without warping the door. Kinda gave up last year as I too thought it couldn’t be THAT hard if you knew what you were doing! But it’s spring and I am newly energised by the effects of a few pounds of turkey, Christmas pud and mince pies. Onwards!
It is a big flat panel so if they just try to seam weld straight across it, it'll end up like a relief of a rolling savannah; but if they do it slowly and in sections, it'll be fine!
The problem with imports is most are for the right side of the van ! Probably cost that to fix yours properly also unfortunately !