Yea, the modelers really took a lot of liberty in making their kit, some of it just doesn't even follow line art at all... They just kinda wanted to do what they thought looked cool. The feet are entirely different for some reason. Not quite sure why, since you'd think that be one of the more direct transitions from fighter.
I do like, however, the model's waist-mounted gunpod (totally reminds me of the FMP Arbalest) and the little turbine gear waist you see behind the nosecone in battroid. Line art sometimes bugs me with their shading that deliberately covers up the nitty-gritty mechanical detail that you'd see in a normal lighting condition. Sure it provides a much cleaner look that's more appealing, but it doesn't realistically reflect what even a non-transforming model would have to look like.
I do think that Yamato can do a better job sticking to the lineart, but this will be one of their tougher challenges for sure.