I would challenge this regulation as in infringment on Liberty. The
concept of Liberty is recognized in the Constitution's Preamble. It
embodies the notion that men have the right to do what does not harm
the interests of others.

It would be a tough case but you might find a sympathetic judge who
would say "Noise can be regulated, unslightly messes can be regulated,
parking aircraft and airboats in a driveway can be regulated, but a man
has the right to do what he wants in his own home or in his own back
yard so long as it does not infringe on the rights of others. The City
of Jacksonville has not demonstrated how a man working on an airboat or
airplane in his own home or yard infringes in any substantial way on
the rights of others. Accordingly, such acts are protected by the
Constitutional doctrine of Liberty."

If you choose to challenge the law, then go straight to federal
district court and file a simple, plain complaint alledging that the
regulation, as written, deprives you of your liberty under the
Constitution Preamble to do what you want in your own home. Stranger
cases have been won.