Jim,
Thanks. Yeah, I think he'll be quite attractive under a light coat of dust. Course, this guy is being constructed concurrent with the giant Tamiya Tiger 1 which has taken on a life of it's own as well.
Sgirty,
The Plasticote T-235 can be sourced in auto parts stores or the automotive supply sections of many 'variety' stores. The stuff doesn't cost much, is very easy to use and results in a 'random' appearance rather than the potentially 'forced' or manipulated look of hand-applied texture.
Cody