I think the Rolls Royce Armored Car should net me 15 points towards my tally!
Beautiful work Miles on one of the most elegant armoured cars of the period. I too just received my parcel from the Trenchworx Kickstarter and hope to have at least one of their models up for the Challenge in the coming months. I agree with you: the quality and detail of the models is really top-notch. I fiddled about and did some dry-fitting of the models and everything fit together seamlessly - very impressive. My only caveat to the models is their price, which is a bit eye-watering.
In regards to your Rolls I love the base sand colour you went with as it really helps to make the rivets, plate-seams and creases pop. I also really like the stowage you added as it really adds character to the model. My only suggestion would be to dirty up the tires, undercarriage and running boards, as from seeing photos from the period, these buggies would get incredibly filthy in the field.
Top shelf stuff Miles!