Do you have a particular (emotional) attachment to this design, or is it just a simple, small biplane you want? The specs I see in it seem a bit ambitious for a VW motor.
If it is just a small biplane you want, go to Aircraft Spruce and check out the Stolp Starduster V-Star SA-900. It’s just a little larger, but it flies on a standard 65-85 hp aircraft engine (like the A-65), it’s stressed to +/- 6g (+/- 9g ultimate), and it is better looking (in my opinion). Stall speed is all the way down to 35 mph so takeoffs and landings are going to be shorter, and payload (pilot weight) can be higher than the Kricket.
Plans are only $195 (small price in comparison to building any actual plane), and since it is Aircraft Spruce, they probably carry any hard to get items for the design.