I was reading that Lucas (With permission) almost 100% copied the probe droid design for ESB from a droid Jean Giraud Moebius drew for his 1976 comic 'The Long Tomorrow'. His work isn't that easy or cheap to come buy, I've got some books like 'The Incal' but not that one.

Does any body have it or a link to a scan of the relevant robot. I would love to see how it compares (btw the image below ain't it).

Some other Moebius art like or about SW...

^ Mos Espa Pit (Click to see Hi-Res)