Begin by measuring the total distance across the top of your tub. We cut our 1x12 pine board to 29.5" and then used 1x6 pine for the book holder. Use a 1x1 for your underside brace so the caddy doesn't slip off the tub.
A Forstner bit will sink your candle pockets into the wood, and a hole saw will cut a spot for your wine glass. We used a router to bevel the edges and add a cell phone holder, but this is optional. Sand all your pieces and stain. We used a polyurethane/stain combination because there's a possibly it will get wet.
Don't forget to pre-drill your holes before glueing and screwing your pieces together.
