Decided to make a stab at a base (1st attempt ever at such a thing) and went down to my LHS and picked up some Woodland Scenics items. Used real dirt from the back yard as the foundation with Coarse Earth, Coarse Burnt Grass, and Fine Yellow Grass along with their Fine Brown Talus for the rocks. Base is a converted black finish acrylic display case with clear top that used to house my M10 Duckbill. Base measures 10"x6".
I know it looks rather plain, but I figured the simple approach was best. The Kettenkrad will be displayed off to the side of the torn up track area as if out of gas with the Pupchen hitched behind it and a single figure carrying a gerry can. Basic idea was that it would have been travelling with larger vehicles (torn up area is about double the track width on the Kettenkrad) and had fallen out while the hapless driver went to fetch some gas. Possible title is "A Pint's a Pound..." in honor of the straining figure (not pictured here).
Any comments/suggestions are welcome.