Found a couple of side views of both a Vega and a Golf, re-sized them until the wheelbases matched then did an opaque overlay of the Vega on the Golf. As you can see the windshield angle may be the stumbling block when it comes to fitting the Golf body to the Vega rollcage. Looks like the halo bar and the front down tubes might even block the VW's door opening. Also note the ridiculously short rear overhang on the Golf as compared to the Vega.
