Thanks for the comments.
The kits are all 1/72nd scale from
Revell. It is surprising how much goes into the Morser 18, but there are a couple of issues with it though. I found that a couple of parts were smaller then they should have been, so I had to make some new parts up. Also the towing frame was missing from the kit too. Got in touch with
Revell in Germany, but they ignored my request for a replacement. So this had to be scratch-built in the end.
As to the weathering on the wheels and tracks, as the scene is to show the halftrack and gun after it has been driving down the road after a rain storm. The spray thrown up has made the weathering look darker then if it was dry. Prior to spraying the Johnsons Klear onto the lower half of the models, the weathering did stand out more then it does now.
The trees were off the shelf ready made. Due to the deadline I had to build this in, there wasn't enough time to make some from scratch. The stand is a MDF base, with the basic terrain built up from foamboard, then covered with Isopon P38 car filler. Various scenis scatter and sand was used for the scenery.