Geren W. Mortensen writes: "Some time ago, I was challenged to design a small, potentially portable, On30 layout that would provide interesting operation, and continuous running for display purposes. The result was something I called The Little Layout. The track plan turned out to be 3 feet by 8 feet, which is just the right size to fit on the tables provided at many train shows. The plan is my expansion of the now-famous Snowshoe and Gumstump track plan, also known as the original Gila Pacific."
Geren's website used to have an in-depth history of this plan (showing its evolution to the final form, plus a couple of suggestions for expanding the plan to fit a 5' by 9' baseboard), but he's been busy moving stuff about and I can't find it any more! I'll try to get hold of Geren to see if it's still there somewhere! <g>
Geren never replied, but Cathy James kindly pointed me towards an archived copy of the discussion (although it doesn't have all the diagrams, unfortunately). Thanks, Cathy.