i was with Larry at the show. i actually think the whole thing was a gimmick to draw attention. there was certainly a lot gawking in disbelief. i'll bet after the show is over, the two outboard engines come off and a little Marine Tex goes into those holes. the cowling of the outer engines actually extend well passed the gunwales of the hull......really goofy looking.
heck, just based the total weight of engines and a known history of other top tier brands having trouble with triples and quads cracking transoms, i bet they won't be hanging on there long.