Re: 14' mirro craft
very simple 1/2 exterior plywood, see picture measure each end,, and the center line of each panel.
draw a center line on the plywood, get the length you need, then measure from center line 1/2 the measurement of each end. get fitted in boat, now you can use a 2x4, 2x2, 2x6 for a center brace under the panel. it is best to leave them loose for easy cleaning, and your favorite lure is surly going to fall down in there.
paint it completely with 3 coats of rustoleum oil base paint. last coat you can throw some sand into the paint for non slip.