The front panels not lining up is the main issue. The gas canisters are way too small. Wheels are too small. If you're going for anime accuracy then the headlights should be square, not round. Side windows don't have glass and don't open or even line up properly... In short, the truck mode was sacrificed for the more accurate bot mode.
Here are some comparison pics. It is neither accurate to the real life Freightliner FL86 Cab it was based off origionaly or the art used for the cartoon.
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