Hey, if someone made a usb keyboard in the shape of an old Corona, I'd get one! (Er, provided it was in the price range of other keyboards.) It's sad that the keyboard market caters more to swoopy pseudo-futuristic design than to retro. Closest thing to retro in that market is the classic battleship grade IBM Model-Ms, with a buckling spring keyclick on both press and return that would resound throughout an entire office and metal case suitable for melee combat.

Oh, googling around a bit on the subject, I turned up this and this. So, there is a market out there for it. Emphasis, however, on the 'out there'.