The best hot rod paddy wagon ever, IMO, was this one by Carl Casper...
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"The Tom Daniel Paddy Wagon model kit inspired some to make his designs a reality."
http://ultimatehotwheels.boards.net/thread/18
PS-Looks like I was wrong again, this time that Barris designed the Red Baron. Thanks for the correction.
"The [Red Baron] project was designed by Tom Daniel and built by Chuck Miller at Styline Customs.[1]"
--Wikipedia: The Red Baron (custom car)