Huckebein Einst (disuse)

I plan to take part in a fan-art Huckebein collection book with my friends.
The 'Einst' (German for 'the past' or 'once') refer to a space-based collective of extraterrestrials that have made appearances
And Huckebein is a human-using mecha. They are in the Super Robot Wars series.

I assume what will the huckebein be when Einst convert it. 
But at last,  I think I can't control this sketch to a well shape, I used other idea.