you can DL the plane for MS2004 here:
http://cricri-mc-15.ifrance.com/wikipedia says:
Cri-cri (after the French word for cricket) is a very light twin-engined kitplane, recognized as the smallest twin-engined aircraft in the world.
Designed in the early 1970s by a French aeronautical engineer Michel Colomban, the Cri-cri aircraft is the world's smallest twin-engine aircraft. At only 16' wingspan and 12'10" length, it is obviously a single-seater, making an impression of a dwarf velomobile with wings at close range.
Cri-cri has superior aerobatic performance; e.g., the one in the picture is capable of 1 roll a second. There are approximately 30 Cri-cri aircraft in airworthy condition in the U.S. and over 100 around the world as of 2003. Word of the mouth around the exhibit said that the designs are no longer available by the author's request, except as a personal favor to those homebuilders that are his friends. However, the fan site below still lists his address, saying that, if you are not in North America, you might still be able to get a design. Also, occasionally, unfinished kit projects are sold, as with every other homebuilt design.
As with any homebuilt aircraft, the existing Cri-cri planes have often been modified by their builders, departing from the original design to a varying degree, resulting in different performance. One flying Cri-cri, F-PZPR, was even equipped by its pilot Nicolas Charmont with jet engines, increasing the cruising speed from 115 mph for the regular propeller-driven version to around 150 mph.
it sounds like an ultralight by definition and if you could get plans, you could probably build it n the US and fly it without a full private pilots license. I would be curious as to how much it would really cost to build such a thing.
