Something else to consider
is what, where, and how you want to store things. Do you want several smaller lockers or a few big ones. If you have most of your stuff, gear already that would help. For instance heavy stuff like anchor, chain, battery, cooler, tool box, water bottles, portapotty, etc should be close to the keel imho. Do you have long stuff like boat hook, manual bilge pump, antenna, whisker pole, paddle you want stored rather than rolling around under the cockpit? Otherwise you may want several small compartments to keep lines, gear, and small stuff from getting all jumbled up together.I guess my point is that the support walls you build for your v-berth can be custom made and placed based on what you want to stow under there. Because of the rim around the cuddy, it makes sense to me to rest the edge of 3/8 inch plywood there and build support walls underneath to support the plywood in the midline of the boat and to separate the compartments as I believe Jeff did. Because the access to the cuddy is small, you will be assembling in there and making pieces without plans wasn't hard. A large piece of cardboard makes a nice template for cutting the plywood. Just use a pencil and a series of trims with scissors to follow the sides.Once you know what you want to store in the triangular compartment in the bow, you can measure back how far you want to place the first side to side support wall. The only place the support walls need to touch the liner is in the midline to support the plywood above. I kept the support walls 1/2 inch above the liner for ventilation and dadoed a piece of starboard (white plastic cutting board) to support it in the midline where the floor is level. That is so any water won't rot the plywood support walls and can drain back. I connected the deck piece with 1x1 cleats and drywall screws, cutout the opening, and painted. I added more compartments going aft in the same manner, with a midline support wall separating port and starboard compartments. I settled on a long narrow compartment going side to side in front of the mast base for my longer stuff, and 5 other compartments including the bow.I went all the way back to the cockpit on the port side since my wife and I are tall enough that we both can't have our feet in the bow, so we will be staggered. I kept the starboard area aft of the mast open for pinning the mast to the base and most importantly having room for a portapotty, since the v-berth is too high for that.With this project you can turn your daysailor into a camper and micro-cruiser. But you will be adding a lot of weight, gear especially since you can stow so much, so assemble with screws only, no glue, and in a year or two when you want to buy a bigger boat, take it all out and see how much faster it goes. You just might want to keep it, and get the bigger boat.Most importantly, all i did came from the ideas, pictures and example from Jeff and this website. Thanks