My friend Dan C came up with the Killer Bee idea and I may be slightly opinionated but I really like it and think you made a wise choice.
Kevin is an awesome guy,I’m sure he could take a Newlon blank or two and make up some dies.CH4D is an option as well as Hornady as others have said.
Looking forward to future posts of this project,I hope others who have built them chime in with pictures they are out there.
Matt