To make a shiplapping work, it is easiest, if the boarda are all the same thickness. This is a bit of a problem out here, as I haven't got a marking gauge. So instead I just eyeball the thickness and compare it to the other boards. I thought that they were all pretty close to each other.
I have reasoned, that it will work with a little difference in the thickness, since the boards will be nailed to the bottom.Sso the inside will theoretically look nice and even. I then plan on setting the heads of the nails, and plane the outside so it will also be flat.
I made the shiplap using a dangerous setup with the handheld electric plane. After a couple of boards, it all went pretty well. I won't advocate on using the tool this way, so there I didn't take a picture of it.
The boards are all about 2" too long, so I can trim them to length after they are nailed in place.
Here is a picture of the finished shiplapped boards loosely laid out on the workbench.
The interior build:
A sea chest need a till for a pencil and the discharge book etc. I also decided that it needs at leas at two small drawers for other small stuff, such as sail makers needles, a picture of the family etc.
The dado for the bottom of the till goes all the way across the end of the chest. The setup is a piece of wood used to guide the saw (the only one I have), if you feel like copying the build, I suggest using a crosscut backsaw of some kind.
The vertical dado is for what will become the side of the two drawers. like a small cabinet side. This is not placed in the exact middle of the board, since I wanted to be able to secure the cleats for the beckets in the center.
There is one more dado, for the horizontal division between the drawers. That one is placed halfway between the lower part of the till and the bottom. So rather unusual, I have not made graduated drawers in the height, but I think it will still look OK, since they will have a different width.
After sawing out the dados, I remove the wood using a chisel. It is also possible (actually advisable) to use a router plane if you happen to have one at hand.