Jim, disastermaster, Sprue-ce Goose, waynec, JohanT, the doog, and Eric - thank you all for responding, much appreciation on your comments.
the doog - I'm particularly stoked to have you drop by and comment. I like the idea of sponge chipping, and will keep it in mind for future builds - no doubt an interesting effect. I kept chipping to a minimum, representing mainly that from crew wear.
The vehicle as portrayed is quite early in the campaign, before the February rains set in. From what I could see in photos, the patchy look was mainly a result of mud. Being assigned to HQ, it likely arrived with the last batch of Tigers of I/501. So from it's landing at the port of Bizerte to deployment in the areas of Pont du Fahs and Zaghouan, I imagine the vehicles would of kept their travels to the road network. This would be the staging area for Operation Eilbote I, slated for January 18, 1943.
Tunisia, though located right beside Libya, is quite a different place. The Sahara desert makes up 40% but is located to the south west, away from where the operations took place. The rest of the region is composed of fertile soil.
An interesting modern photo of Zaghouan, taken from the roadside.
regards,
Jack