>>9834876>Was this an actual vehicle in the original line?Nah, it's concept art by Mark Taylor for a potential 1982 vehicle.
Mark was the earliest creator of Eternia: Castle Grayskull and the earliest He-Man and Skeletor designers were part of his private Sword & Sorcery setting and he and his wife made the stickers/cardboard cutouts in CG from their own imagination. As it became a paid project, Mattel wanted vehicles and that Battle Catapult was rejected in favor of bringing in Ted Mayer, who created both the Battle Ram and Wind Raider for that first year.