How about this idea... What if you stretched it only about 4-6 inches and then fab'ed a reverse opening door (similar to the Saturns 3rd door or all of the new style crew cab pickups)? It might even be possible without a stretch, though difficult, in which case you wouldn't need a donor. Just a mod I was thinking of trying.

The VX already has a spacious back seat so you could move it forward (with the stretch) and leave the extra room in the back.