I'm not an artist so this is coming from a fanboy's perspective.
I really like Pat Lee's "Transformers". They are very Anime but it just worked so well.
Chris talked this week about Geoff Darrow. " Hardboiled" and "Rusty the Boy Robot" both have excellent use of robots.
The animated film "Iron Giant".
Old school Kirby FF. You can get a good sense of weird machinery in any scene with Reed's Lab.
That's it I'm tapped out. Hope that was useful. Keep us up to date on your project and good luck.