Originally seen at the Japanese TF Image Board It's the bottom picture. The vehicles are certainly Overlord's, and the robot mode's proportions are the same as the big guy. But... inidividual robot modes for the Giga and Mega vehicles? And take a look at that robot mode head. Was Overlord originally meant to be a Megatron? (For the record, I can certainly see the individual vehicles originally being planned to have their own robot modes and Overlord be the gestalt. If you look at the prototypes of Godbomber, against the finished product, you can see there was a move at Takara at the time to simplify designs and therefore reduce costs. I think Overlord's individual robot modes were killed for the same reason.) The other two, incidentally, appear to be Sixshot, with some sort of add ons for each mode, and Liokaiser, with... Deathcobra?