depends what the base van is and what the interior is…
Is it a camper, what type etc. If it has some interest, and even an original brown interior could be interesting, it may be of more value as it is, rather than trying to get it done “quickly”
As it is quite late for a bay window, it probably will not have much interest for the “enthusiasts” unless it is a double door microbus with a factory sunroof…
try Volkszone or earlybay for opinions, and in my opinion, if you do get it fixed, get it done “properly” otherwise it will not be worth anything