I need some help folks. Tonight after installing a new battery selector switch, we cranked the power on and as a result the (2) 75 amp AGM batteries blew the vents and vented a cloud of sulfuric acid gas. I switched the selector to off and exited the boat with my son who was helping me at the time. We stood outside and waited to let the gas disperse, we soon noticed that more smoke seemed to be coming from the open hatch. It was difficult to see into the rear berth with the gas still issuing from the boat, but I managed to hold my breath and peek inside. The selector switch mounted to the rear berth bulk head had shorted out and was on fire, I grabed the fire extinguisher and gave it the full bottle. It appeared that the fire was out, but there was no way to crawl inside to be sure. I asked (real fast) for my wife to call the local fire department and continued to look for any additional signs of flame or heat. I was lucky as my wife came back out to help she noticed that the cockpit floor was starting to heat up, we quickly disconnected the under cockpit floor gas tank and pulled it off to the side. The Fire Department arrived and entered the rear berth area and disconnected the battery cables with the aid of a Airpac. The remaining smolder was put out and they declared all safe.Now the major problem.I have fire damage to the rear berth compartment fiberglass, the rear berth headliner, the underside of the cockpit floor and smoke and water damage to the entire interior. The fiberglass inside is blackened and burnt and the exterior on the floor tank well and the cockpit floor is blistered enough to have cracked and peeled the Gelcoat. Only the Lord knows how much damage was done to the wiring system and the outboard wiring.The final question.I am fully insured and plan to file a claim in the morning. Followinng the adjustment process, how do I find a company to do the repairs. This boat has a one piece fiberglass headliner and I am really worried about the repairs to the cockpit area.Hopefully, someone has a recommendation of a company in Florida that is capable of performing this scope of work. Sorry for any spelling errors, it's late and has been a hard night.TIA for any input or recommedations.J. R. Setser