Jeff Flygare did Centuri kits, well before my time.... the Fighter Fleet jets, the UFO, I think.

I'm not sure what else Bruce Carey did.

Hellmund didn't do any Estes kits that I remember (I'm sure he will jump and and correct me!), but did do the design that became the NCR Black Hole Betty. He did do most of the Light Gliders, and some of the WestWings gliders that Estes put out.

Matt