Recently there was some discussion of a 'toy soldier scale' (1/30) range of figures and vehicles made by Norwich-based collectible soldier producer John Jenkins Designs:
http://www.landships.net/t57789219/for-collectors/
It may be of interest that he's released a Gun Carrier Mk I in that scale:
http://www.jjduk.co.uk/index.php?route=product/product&path=78&product_id=595
A snip at £248...!
Oddly, on his other website, where all prices are listed in US Dollars (and where his address is listed as Hong Kong), it costs $298.
Why is it green?
Looks like the designers couldn't make up their minds whether it should be a gun carrier or a supply vehicle.
Regards,
Charlie