Learnt something new tonight:
http://www.allspark.com/content/2014...carousel-24149

Evidently the cartoon model for G1 Orion Pax was originally going to be Ultra Magnus. Although the Diaclone Powered Convoy toy would've already existed at the time that Transformers The Movie was being conceived, I guess that at the time, Hasbro hadn't decided on which toy was going to become which character -- in this case, Powered Convoy becoming Ultra Magnus -- and so Sunbow came up with this design for a character who hadn't been assigned to a toy yet!