I've been thinking the very same. I like the golf country. Might even pop over to Germany to buy one, one day.
The way the Mk2 is done is using a type of under chassis, which is simply bolted straight on. The engine sits lower in the engine bay too, as the subframe is lower. Just about everything is stock apart from the steering column, brake pipes and suspension. You need the 4wd system too.
The fromt and rear nudge bars wouldn't be hard (standard item, modified), although the rear was only added because the rear diff made the floor too shallow. Might be able to get away with it on the lupo.