I think it's a great idea. That's one of the ideas I am mulling over at the top of my list: buy a 4-cabin cat out of charter
because it's cheaper, and then converting one of the cabins to an office. The Leopard 46
would be a great candidate for that. What kind of catamaran are you converting?
Honestly, I wouldn't worry about it affecting the resale value -IF
it looks like a professional job. In fact, if the desk looks exceptionally nice it should only increase your boats value! You are not the only one that needs a workspace more than he needs an extra cabin