The Transforming Mechagodzilla's appearance is reminiscent of both the Showa Mechagodzilla and Heisei Mechagodzilla, with the addition of being able to split into seven different ships. Eventually, this was reduced to just two vehicles, with Mechagodzilla's upper body becoming a jet, and its lower body becoming a tank.
This feature was reused, albeit heavily toned down through the use of the Garuda and Mechagodzilla fusing to create Super Mechagodzilla in the final film, and also inspired M.O.G.U.E.R.A. being able to split into the Land Moguera and Star Falcon for Godzilla vs. SpaceGodzilla.
The Transforming Mechagodzilla's role was nearly identical to the normal Heisei Mechagodzilla's role in the finished film, however one of its individual vehicle forms would have battled two pteranodons early in the film on Adonoa Island. This Mechagodzilla would have successfully killed both Godzilla and Rodan later in the movie, but the Garuda would be destroyed and explode, causing Godzilla to be revived by the released radiation and thus destroy Mechagodzilla.
- The Transforming Mechagodzilla was likely scrapped due to how expensive and difficult it would have been to portray the various machines and their fusion into Mechagodzilla. Toho may have also wanted to avoid too much similarity to King Joe, a mecha created by Tsuburaya Productions which moves around and transforms in a very similar way.
- The Kaiju Guide entry for Super Mechagodzilla in the 2014 Godzilla video game references Transforming Mechagodzilla.
- The early artwork poster for Godzilla vs. Mechagodzilla II drawn by Noriyoshi Ohrai features the Transforming Mechagodzilla. This is notable, in that it is one of the few instances of an unmade kaiju or unmade design for a kaiju appearing in a piece of official media for the completed product.