You will probably get a better response asking on one of the American forums as I doubt many have been made by members of this forum if any, best one would be the model section of SmokStak. The Woodpecker is quite a nice looking angine and a decent size.
I have had a couple of casting sets from Doug Cvelbar at Minicastings who has been fine to deal with and the casting quality was good.
I can't think of any build threads off hand but if I think of one will post the link.
J