I don't understand any of this. It's not worth much without these, so buy the whole thing and haul it home then take your time to do it right. If the motor and trans are good then you may even be able to... DRIVE it home?
It just doesn't seem like an urgent ASAP situation, except that you got fixated in doing a certain thing. I suppose I don't know the situation, whether this guy is going to let the carcass rot on his property or haul it to a junkyard for scrap value, but even that, is not much compared to having the whole vehicle yourself to deal with at your leisure.
Usually something that gets rushed, looks like a bad idea in hindsight.