Don't even be thinking thoughts like that or you're never going to end up with a van. The wrong gearbox is much easier to fix than a rusty pile of crap. I've got a pile of Automatic cars I'd happily trade the auto setup from one for a good manual setup.
Don't be picky on the little things. Find the neatest straightest body you can and buy it. Everything else can be sourced from a $1000 donor vehicle and all leftovers sold off. That's the beauty of the Sandman Replica. The good body is the only part in high demand. Everything else is run of the mill stuff easily sourced from a less desirable model and available in abundant quantities. Just check ebay's restoration and damaged cars section for how many HQ-WB's for sale.
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