Mark Smith wrote:


any ultralight may be disassembled, rebuilt, and N numbered as a
homebuilt,

that is what should have happened to stay legal for the past twenty
years or more,

That was my thinking too. But supposedly after a couple of years the
FAA will not allow 'Fat' ultralights to be re-certified. Two
obvious questions being how would the FAA know what the homebuilder
started with when he started (re) building it. How would, (and
why would) the FAA distinguish between a rebuilt 'Fat" UL and
a scratch-built knock off of a 'Fat' UL? Voluntary compliance
I would suppose.

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FF