Yes all of the plywood and timber is going, there is no need for it. What I am fitting in its place is stronger, lighter, has sealed cells, will not soak up any water and no rot at all. Also because of how much of it I purchase from the factory each year it is cost effective for me to use it however even if it was more to purchase I would use it instead of even the best of marine plywoods. Don't get me wrong I wouldn't use just any core instead of Plywood, pretty much all types of foam for instance is in my opinion a complete waste of time as over the life of the boat you can end up with fracturing through the core material as well as increased risk of de-lamination from the surface when shock loads are applied. I have found through quite extensive use of core materials over the years that the one I have is by far the most durable.
Well yes I only manage to get the odd hour here or there to spend on this project, If the resin had turned up so I could finish the tank space this week I would have already had the deck down in this section but that will have to wait till after next weekend now. Trouble is once I pick up a Cengar the "Red Mist" descends and before you know it I have a whole load of extra work to do because I know I can do a better job if I do it myself