I had fun putting together this delightfully impractical vehicle. It's pretty simple though - a Hot Wheels 'Hi-Way Hauler' with a resin T34/85 turret on top.
I added some metal plates made from card to look like improvised repairs.
I also distressed the original truck to give it a battle-damaged look.
Painting was a simple coat of green with lots of washes and dry-brushing, similar work on the metallic bits and then a few layers of brown and yellow-brown dry-brushing for the dust and dirt.
I may add some slogans and a red star or two, but at the moment I like it how it is.
You wouldn't want to go around a corner at any speed in that thing though.