I read somewhere that he sold his rights to the building to another guy.
I believe, that that guys was David Clark, who in turn resold them to these guys:
http://www.waterfowl-works.com/layout_boat_plans.htm
It does not actually use Busick's name on it that I can see, maybe he just sold the design, and not his name to go with it...or maybe the story I heard was wrong.
I have those plans and they are the Busick boat but from looking over the plans and pics I've seen of completed boats, I think it will be too heavy for me to manhandle on and off my 14'er as I usually hunt by myself.