Id tell him you need some $$$ down and then he can make paymens on it and come by and look at it in your garage when ever he wants. maybe even sit in it and drink a beer if hes lucky. And when he gets it payed off he can take it home with him. LOL. Walmart used to do this also "minus the beer part" It was called LAYAWAY!

Obviously not a Walmart in Canada!

That was my thinking too...NO WAY would I let someone take the boat home until it was paid in full. The odds are he will blow the motors up or damage the boat in some way and then stop paying. You will end up repoing the boat and be stuck with a big repair bill. Think about it...most people keep paying their bills because they dont want a ding on the credit report. An owner financed purchase doesnt report on the credit report which means they will have no real reason to make their payments if things get tight.
Its just not worth it.

did it with a friend,for a baja 240 sport....took him six years to pay for it;we finally did the transfer last week....never again