Try painting the birch plywood box and adding ash veneer tape to the edges to give your modular boxes a distinctive look. For a more colorful accent, paint the entire box. Or you can accent the birch plywood with walnut plugs and veneer. You’ll likely need several hours to build and finish seven boxes. Before you begin, assemble materials and prepare your work area. Then follow these steps to learn how to make DIY modular boxes. Be sure to measure the exact thickness of your plywood before cutting the sides, as some plywood might be slightly smaller than its stated thickness. That inconsistency will throw off your measurements for the sides of these boxes, which are sawed to 10-1/2 inches wide to allow for joining to two thicknesses of 3/4-inch plywood at the top and bottom. So before cutting, measure the plywood’s thickness, then deduct twice that from 12 inches for the width of the box sides. To make sure that all the box pieces are square (if they’re not, they won’t fit together correctly), use a framing square to check the auxiliary fence before cutting. Use some scrap plywood to make a test cut. With the framing square, check the test piece. Adjust the setup if necessary.