Leon Davis DA-11

Hi All.
Just a quick one. Was watching discovery and saw a few aircraft including
the Cri-cri and a DA-11. Both are very small and look like great fun. My
main point of interest is the DA-11. It is a small single seater, with a
cylindrical fuselage, and would you believe a Briggs and Stratton 2 cylinder
lawnmower engine of 18HP. Reportedly does 100kts. The aircraft was built
by a chap called Leon Davis, who also built a 2 seater called a DA-2. Does
anyone know if more than one was ever built, and if there are more, are
there plans and/or kits available. Looked on the internet, but only found a
few pictures.
Thanks in advance for any replies.
Rob Fonhof

Melbourne Australia.