Cut a 2x2 to your shelf length minus 1". Cut 2x2 "fingers" at 6 1/2" — one for each stud you'll hit, at least three per shelf. Screw the fingers to the cleat at your stud spacing, making an E-shape (comb) that will be the shelf's skeleton.

Rip your 1x10 into two skins (top and bottom) at 8" wide × shelf length. Their quality faces point out — the best board you have becomes the top of the shelf at eye level.

Glue and brad-nail the top and bottom skins to a second 2x2 front rail so you get a hollow box that's open at the back. Dry-fit over the wall cleat: it should slide on snugly. If it binds, sand the fingers, not the box.

Glue the thin strip stock over the front and both ends to hide the sandwich construction. Trim flush after the glue dries. Sand to 180 and finish — oil looks best on the edge banding joints.

Find your studs, strike a level line, and lag-screw the cleat through into every stud with washers. This is the load path for everything the shelf will ever hold, so no drywall anchors, ever — studs or nothing.

Slide the box over the fingers. A friction fit usually holds; for insurance, drive two small trim screws up through the bottom skin into fingers where they won't be seen. Load with books, step back, accept compliments.