Just a Thought
I'm not at the boat today, but I have just finished the installation of and Air Conditioner in my 93 H30T. I removed and reinstalled the facia to the vanity in the head. I explored removing the settee to run duct work to the vee berth, but decided against going that far.What I had to remove were the screws to the inter corner cleats. This allowed the facia to come free of the bulkheads and the seperater. I also had to remove the screws that hold both of the blukheads to the facia. Therefore I suspect you will have to remove all of the servicing panels in the doghouse and access the screws to the inner corner cleats. Wether or not the rear panel is a part of the rear bulhead is unknow to me. But suspect so. I think that is too much to remove. The forward panel and the Starboard panel may give you enough elbow room. I have never done this, so I don't know for sure. but just speculating that this clue might give you the edge.Good Luck.