I drove a screw into the top of the stem, tied some line to it, and ran back to the installed chainplates and marked their location on the line. Then I used those marks to locate the port chainplates. I bedded the cleats with 3M 5200 Marine Adhesive. The amidships cleats are between the center and aft portholes, which may not be the exact widest part of the boat, but are close. The forward cleats will be installed after the bowsprit goes on, which has to happen after she's outside because of length.
Boat house is too short.
The picture quality is not that high, but this is a premium piece of douglas fir, salvaged from my dad's woodpile when we moved my parents. Best I can tell, it was bought some 30 years ago when he was building the patio cover on their house. Because the forestay, which holds the mast, is attached to the bowsprit and takes the major stresses, I decided to go with a solid timber. I almost bought hardwood, until I cut into this 4 x 4 and found what a fantastic piece of wood it is. I haven't decided if I'll go the traditional route and cover the inside of the jaws and the face of the tumbler with leather, which is then lubed up with a generous supply of lamb tallow.