I want to point out another reason this size is bad, because I'm like that. (New size is fine, but the old one I'm talking about)
This kind of size is, indeed, quite hard, and managing it would be a bitch, but also it's hard/not good because there's nothing going on in the grey area.
In the smaller version, I'd make the ramps less straight, as in maybe tint the grey blue, and add some greebles.
Greebles are good. Maybe some defensive stuff (Guns) or some battle damage, or rust, or plates that stick out, indicating imperfection, which is almost always way more interesting, as aging something gives it more personality IMHO. Keep at it! Remember, the greats started out like you.
EDIT:
Btw, even smaller would be good.
Toodles!
Shrike