IMO there is no way to get a transforming toy done that closes to the line art. The chest plate of the Yamato fighter is stretched while the back end looks close to the line art, the other way around for the Arcadia. The Arcadia has the front end proportion, but the feet is wide and stubby.
The Yamato version is optimized in long and sleeker Fighter mode, but skinny Battroid mode which is the other way around for this new Arcadia version.
The conclusion is no way you can change something in sleek mode into stubby mode without morphing it.