Ok then hun, your not about to like what I say but the sad fact is that it's pretty obvious that the seller does not want to sell it for the price you bid. And you definitely don't want to take it without the paperwork, keys etc as your in for a huge expense so I can only see 3 courses of action,
1) walk away and get a refund, chalk it up to experience, sleep snug in the knowledge that it was probably a dodgy motor ( I know I have a soft spot for millies too!
2) get someone to contact the seller, go along with them as 'the friend', don't mention anything about ebay etc, give the car a thorough once over, test drive etc, then if you like it haggle a price, if you can come to one that you are both happy with then hand over the balance between the price you paid on ebay and the rest, explain the situation with a 'If you had only said you needed more money we could have sorted something out'....and don't forget to smile. I know this goes against principle but if you really want it..... On the other hand if it turns out to be a shed you can walk away and as soon as you get in your car get on the phone to pay pal, not mentioning that you have seen it just that you would like a refund as you obviously will not be receiving your goods. This may however be tricky as you have already left bad feedback!
3) do as 2, don't mention ebay at all, just get a price you would be happy with or walk, keep the ebay thing completely separate and just get your money back from them (to be honest this would probably be my preferred option then at least you have the money back).
Best of British, please deep breath, calm place, Oh and Yvonne you said you were keeping your puma for me in 4 years time! :wink:
Edit; sorry just read post through, perhaps not for a test drive then! Shame the body work looks to be in good nick.