More Sideways than forward..

Had the upholstery guy over yesterday giving a bid on something else, and he saw the notch, saw the lack of headliner, some panels, shitty vinyl, etc.he gave a rough estimate of 5G's to completely redo the interior, top grade leather, custom panels, headliner, the works. Is that about average? Also, he said the ONLY way to go is with leather; durability, sun, etc., but don't some of you guys prefer the vinyl for some reason? Thanks in advance.