Thanks for the advice, all.
I had looked at the Brooks site and they are all guns Id like to own/build.
I wasnt set on making a Griffin, just liked the Colrain Griffin barrel & thought there might be an interesting gun to go with it. Maybe there was something special about it that I might want to copy.
I think ill wait for the Grinsdale book-probably several American fowlers that would accomodate the 16 ga barrel I like. I grew up in PA, so maybe a PA fowler would be nice if the style fits the barrel
As for handling an original-I live in western Colorado. Only originals Im likely to run in to use 209s, pellets, and sabots ;-)
Again, thanks for the advice