I was asking almost the same thing a couple of weeks ago. I had been looking at the ones they do in Halfords and was going to do a sort of Mini GT Performer.
I ended up buying a Mini Mag Burner off ebay to restore. I'm hoping to get the frame and forks back in the next couple of days. The chrome wouldn't clean up so I've got it powder coated. I will post a few pics up when it's done.