NOTE: There is a screen tone over the entire image that makes it appear gray. I've tried to remove this using Photoshop without success. At some point I'd like to color this but it will take a significant amount of time that I'm currently not willing to invest.
MORE NEWS! I heard from the friend of mine and Dennis's who first gave me the booklet and he confirmed that they were originally designed for TSR's Buck Rogers role playing game. They were never finalized and put into production, probably due to the shake-ups happening at TSR at the time.
And on the Star Frontiers: Alive and Well group on Facebook, Matthew Teets shared this Star Frontiers Skimmer that he purchased years ago. It's obviously designed by Dennis Kauth as well. (A couple of images have been added to the bottom of this post.)