Hey Rokkit! You got it right - this was a series of Illustrations by Bruce McCall for playboy in the 70s. There is a compilation of his work in a book called 'Lazy Afternoons' with some absolutely unmissable images in (BF109 flying through House of Lords etc.)
Everyone else (asking is it a real design - hmmm take a close look and think really hard - would it really fly?) read the commentary (especially the bit about no guns).
The ISBN is listed in my previous post - I thoroughly recommend it (especially for 'Popular Mechanics - written so even you can understand it')
