I've been doing some research on marine ply recently, as I'm replacing some of the interior wood in my seafarer 30. Apparently Marine Ply uses the same waterproof glue as exterior ply, the main difference is the lack of voids in the wood. For structural use I agree, I wouldnt mess around with the cheap stuff.
What are people's thoughts on plywood for interior use? (cabinets, galley, etc.) Is marine plywood necessary? The wood I removed is 3 ply 1/2" with a teak veneer. I'm thinking the teak veneer isnt really necessary, I'll just stain the wood to a similar colour.