Like every airplane, the Hughes Kaiser Model 1 (AKA Hercules AKA Spruce Goose, Howard forgiving) passed through a series of concepts before his design being frozen. So, behold. The concepts were numbered from 1 to 7 (the "good" one) and you can notice influences from a number of famous seaplane...
battleoftheatlantic
defense plant corporation
department of commerce
hughes - kaiser one
hughes aircraft company
kaiser cargo inc.
reconstruction finance corporation
united states
united states navy
world war ii
Here is quite interesting cargo aircraft project by Kaiser Cargo Inc. It may have been studied parallel to Hughes HK-1 Hercules:
http://warandgame.wordpress.com/2007/09/08/kaiser-tailless-airplane/
NACA report(very technical...) as PDF...
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