imo the little ligament thing should be part of the central structure, and straight, not separated(though i might be wrong since i don't remember what the original looks like). i don't like the rounding. the original had a look of a tank with deflective armor, the new one, especially due to the scales, looks too organic.
what you could do is beef up the existing plate armor protrusions...small plates like reactive armor. that would add a lot of nice details in keeping with the original look without going overboard with smoothing. imo, the thing is supposed to be boxy, it's not the result of hardware limitation. look at the rendering. it's so much more rugged looking. i think what you could do is make the edges hard with just a slight bevel.
aside from that, the engine looks nice. not a fan of the various inlets. and once again, the whole scale thing is inconsistent.
