I remember when he was building them,,and an Article in American Handgunner I believe,, but I for get the year.
The article featured him on a Safari for some of the Big-Five,, he took a Lion as I recall not sure what else.
He also developed a special load for his Redhawks,,,A Wilson Hard Cast 300 Grain LFN Bullet,,on top of 26.0 Grains of Winchester - 680. It was a stout load (at least to me) He called it "Wilson's Anything,,Anywhere Load" I've got about 1/2 a box in the ammo cabinet.
Price I can't help you there,,,but I have never seen one other than the guns in the article.
Interesting shooter/collector.
Terry