Oooh, are you a Ghibli fan in general or is it just the mecha?
Love the droids and their base.
Dewey came out awesome and while he doesn't need a base I am all about da base (you can shoot me now). Generally because the base is usually where I get to be creative, but since you scratch built Dewey anyhow hmm. Here is how I see it, I think Dewey came out awesome and deserves a nice looking backdrop more than a "base". I'd like to see him on an L-shaped base that could be modular if you later decided to build his bros. Just simple flat surfaces with some panelling and light weathering to emulate a sci-fi environment. You could make it like the nicest set of bookends ever!