Harry...

You might want to contact the FAA directly to get their scoop on it..and
contacting the Coast Guard as well....yes I know you are NOT going to use it
over water....BUT since there is air above BOTH land and water the Coast Guard
MIGHT happen to know when the FAA considers it it a plane rather than a
boat....or at least when the Coast Guard considers it a boat or WIG vehicle
rather than a plane.....

Again my limited understanding is it aint a plane if it cant get out of ground
effect....you just better be darn sure it CANT to keep you outa of trouble.....
also, might help to go ask these questions over at one of the hovercraft forum
since some of those folks appear to be interested in WIGs....there might even
be some wig forum somewhere that I dont know about...

keep us informed..at least I know I am interested....

take care

Blll