Hello and welcome to the forum.
It has been done before and it's a pretty good conversion to do when you think about, modern engine, good performance and brilliant mpg in a small car. I don't know much about the conversion but it's not supposed to be one of the easier ones hence why you don't see many about, but it is doable. There was a guy that used to use this site that did it and he was user A7 UFO so if he's still about you may get some info off him about it.