Can't find a pic now but Barris actually did have a Merc painted up like the box art car.
Didn't look anything like the kit besides the paint as all the kits were just reissues of older kits with new decals and , with 1/2 of them, all the parts missing except the ones to build what was on the box.
No new or unique parts, just another case of Barris tacking his name to anything that would stand still long enough.
Ig-blankin'-zackly. I recall being amused at the thought of poor ol' George trying to sustain his legacy by designing garish decals for model kits.