I took an engine out of a puma and put it in a fiesta, I just spent a few hours on it here and there so it took quite a bit longer than it should have done. I'm sure I could have done it in under 4 days if I did it in one go.

Bare in mind, this was a very straight forward conversion which is very well documented on the web. I didn't need any custom parts or anything other than what came with the donor car.

What your talking about is alot more involved I believe