
Image from Aurora Prehistoric Scenes
According to a 2007 post at Drawn! The Illustration and Cartooning Blog, comics artist Dave Cockrum designed some of the kits and their box art, though the above anachronistical joyride doesn't seem to be his. An interview at Comic Book Resources indicates that he was really only responsible for the T. rex and Stegosaurus.

Image from Aurora Prehistoric Scenes
Here's his T. rex box art, but unfortunately the Stegosaurus wasn't meant to be. It's a shame, because it easily twould have been one of Aurora's finest kits.

Image from Aurora Prehistoric Scenes
There's also a sketch of a proposed Parasaurolophus model on the tribute site, signed by Cockrum, but it must not have left the early planning stages. These old kits seem to inspire quite a bit of nostalgia, and I can see why. They have a pulpy sensibility to them, a mix of B-movie inspiration and scientific curiosity. When all of the kits were assembled, their bases could be fit together into a wild, improbable crowd of ancient beasts and cavemen. If I had been kicking in the early seventies, I would have been crazy for them.
Side note: sorry if this post popped up prematurely (and incompletely) in your blog reader of choice last night - I accidentally published it as I was starting the post. I deleted it immediately, but it's still sitting in my Google Reader.