Looking forward to the forthcoming instalments!
Thanks for the Games Workshop tip...never thought to look in there for bits. Your right about the link - I've just found the C3 build again and it's awesome. The one I'd seen has a link to his page but you probably know of it already (Modeling Factory)
The C2 is here...enjoy:
http://www.sankaido.jp/f1modeling/m_.../02/index.html