Kitfox does build SLSA I currently own one. They do not however have ELSA Kits, and you can not build a Kitfox ELSA. You can take an SLSA and covert it to an ELSA. Why would someone do that? If I did that then once converted, I could add an Auto Pilot, or I could add the Bush Gear Legs, or I could use the STi Wing. As long as it is an SLSA, the owner can not make any changes to the aircraft, without written permission from Kitfox.