Insurance on older factory, or brand custom built houseboats is tough. Actually, had I known I wouldn't be able to insure my boat, I wouldn't have built it to the current ABYC standards and probably would not have had the Coasties perform their inspection.
Every company I checked would not insure because of, now get this, we built the 32" by 36" pontoon logs out of 14 ga. stainless steel. Three 12' chambers on each side. This boat would need a direct hit from a Howitzer to go down.
Uninsurable stainless steel.....go figure.
Good luck on your quest,
Edd
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Chance Favors The Prepared Mind!