Thanks, all, for these posts. It's great to see homebuilt aircraft featured here at SPF.
Calvin Parker's designs were revolutionary in bringing factory-type all-metal contraction to low-cost, low-power homebuilt aircraft.
Gary Watson's Windwagon was derived from the Teenie Two and there is still a builder's Community supporting the design.
Watson's Windwagon in turn inspired Morry Hummel's Bird and later Ultracruiser designs which are still popular today.
And Hummel's designs inspired the most recent development, Bruce King's roomier BK1.