wrote:
popular jargon at the FAA.

Don't non-FAR 103 compliant homebuilts require an airworthiness
certificate? (That is what I wrote.) Won't homebuilts now be
Experimental Light Sport Aircraft?, Is that the part I got wrong?

What if the 'homebuilt' was a factory built 'Fat' ultralight?


If the aircraft meets the 51% rule, it can be registered as an amateur
built experimental. A factory built, 'fat' ultralight must be, legally,
registered as an ELSA.