I can try a mockup later but I think Prime's eyes would be level with the base of Magnus' neck. It's not a pronounced height difference. They're playing with height more. Sideswipe is close to Voyager height but has less depth. Hound is the same size class as Sideswipe but shorter and includes a transforming weapon. Shockwave could be a leader due to needed transformation depth/complexity but a Voyager sized figure packed with a throne or Reflector triplets.