In the overall looking, I do prefer the MK1, though I do agree maybe some tweeks could be made so it fit better in the overall environment. (maybe make the legs bulkiers as they look quite easy to shake of the frame :/ ).
Now speaking of the MK2, truely speaking, the first word that came to my mind when I saw the pic with the wings and pilote seated : a WA:SP (Warframe Advanced : Strong Position) (okay the name is lame sorry...)
Anyway, this one does look nice too but does approach too much the human body, so it's like we are just focusing on imporving the performance of what we have already, I'm gonna refer to the manga : "Knigths & Magic" where the main character (which is a big fan of mecha) just say that , well, it's just wrong!
Effectively, mecha does allow us to not only improve our existing strenght, but also allow the unreacheable for us, weak creature, to be accessible (ex: wielding a melee, shield and 2 guns at the same time)
A shape that would be more humanlike, to me, would feet better "manual" works where you would probably feel more confortable with a similar shape than yours to do the job?
this is just a suggestion and expression of my opinion.
but yeah, don't give up on first version, don't do OVERQUALITY either (especially when you do not have that much money :/)!