As far as Collector's Brass goes ..... I've never found a web site for them but have found their products elsewhere. VLS used to carry them but now are discontinued, The Barrel Store does carry them but are also in the process of discontinuing them. Here's a link to their catalogue (prices are in Canadian $)
http://www.bentbutnotbroken.com/CollectorsBrass.htm
You may also want to check out this kit from AFV Club, not too sure what's all included.
But like Ponch has already pointed out, they are not a tough scratch build project at all.
You may want to give it a try.
Happy Modelling and God Bless
Robert