$550 for carpeting from Vintage Motor Cars
https://www.vintagemotorcarsin...carpet-kit-interior/
https://www.vintagemotorcarsin.../interior-speedster/
$2000 interior vinyl
$605 each seat
SO about $3155 for all bits
Remember you need a kit for a VW pan based car --- not one for a tube based car or even an original Speedster.