I know it's possible in a fiesta mk1... 2 year's ago here in Holland there was a man with a orange fiesta mk1 (could have been a mk2) at the lelystad meeting.
He build it him self. There was a 2.9 V6 WITH TURBO in it! He build it fully race, so didn't drive on public roads.
Too bad we had rain that day. The car had too much power to be handled...

There was only one problem... He only can sit in it alone.... The turbo has taken place on the passenger seat