I just saw this post and thought I'd reply. I completely debadged my mk1 punto the other week (apart from the front, I think it looks better with the badge on than off)
Filling the holes is a piece of ****, get behind the holes by taking the bootdoor trim off (1 screw + panel clips) tape or bond repair mesh over holes, get back round the front of holes, use p40 fibreglas filler, sand and paint, a damn sight quicker and easier if u have non-metallic paint, add as much lacquer as required and you are done, just remember to mask the bits you dont want paint on (I know its obvious but some people think its not important)
Dont go to some body shop for them to quote you unreal prices, I know someone who paid 40 quid for a job that looked no better than mine.
Hope that helps