When it comes to adapting screen first characters I think that there are pros and cons with using and not using faux vehicle kibble. An example of this is Voyager Class TFP Optimus Prime. The First Edition Voyager uses a fake chest kibble but also generally looks nicer and more screen-accurate in robot mode. The TFPRiD Voyager doesn't use a fake chest but is bulkier and arguably more ungainly looking in robot mode. TFPFE Voyager OP looks nicer, but TFPRiD Voyager OP plays better and you can appreciate it more from an engineering/design perspective because they didn't "cheat" by using a fake chest.

Pics for comparison...

L: TFPFE Voyager Prime with the fake chest ←nicer to look at
R: TFPRiDBH Ultra Magnus (retool of TFPRiD Voy OP of course); no fake chest ←nicer to play with