The matchbox vehicles are great, but check scale. I found a list on line containing the correct scale for the whole range. The range from 1:32 to 1:86, most falling in the 1:40 - 1:60 range. Note a few, including the Crowley truck are 1:48, the same scale all my ARBM vehicles use.
Make sure you get the accessories pack from Eureka Miniatures. It contains all sorts of goodies. Nic also has a few new car bodies to select from. I am sure he will bring them to Little Wars.
Proof there are sooo many bits to chose from.
Photos of the final product still to come.