Hi,
What engine is it?
I would say you only have to price up the extras. I think it is expensive as it hasn't even been made into a camper, which I would at least expect at that price. So basically a sound system, 2 captain swivel seats, R & R bed and the body kit/spraying, alloys, plus the indicator lenses at the front. I would say £2K too much?
With finance on cars they have very strict criteria, I looked into it when I considered a 7 seater family car. They said 8 years old or less was ideal for them and under 100,000 miles. They would go a bit older if it had low miles. Not likely for a 2001, you would need to know the mileage when he got it. Either way that would show on HPI checks.
The only possible way he could have loaned money would be separate finance agreements for the kit but not for labour costs like spraying unless it was a bank loan. He could have got finance from different companies, if you check out T4srus they offer finance for kit but this is a loan against your own name, not the vehicle (same as the bank). As already said they only other possibility is the log book loan which is a totally different game and the vehicle is at risk if it doesn't get paid. That said if he took out a loan against the vehicle to do the work then they would have only valued it similar to Parkers, which doesn't explain how £2000 has become £6750 ???
I would say if you have that kind of cash available, do it yourself and save cash? Or rather than risk so much money on it if you don't know what you want, get something cheaper and more cheerful as the potential for loss is less...till you know what you want.
There are loads of different style vans on here in threads etc and many ways of doing it. I personally am not sure about the high spec? There is only the body kit, R & R and a sound system. Not sure that is high spec, it is all body kit and a few bits extra?