Debbie, you should have about all you need from the picture and dimensions on the Pottery Barn one that you referenced. Without doing the math, you would need a sheet or 2 of 3/4" birch plywood and a sheet of 1/4" birch ply for the back. You could do all the cutting with a table saw that is also equipped with a dado set. I estimate the cost would be $125 for wood, $60 for paint finishing. You could stencil more if you were doing it. The "windows" could be made with a router and bits plus what would be scraps from most woodworkers scrap piles. If you need more than that, you may as well buy the one from Pottery Barn. As you can see, the price, when you add some labor and profit, is not going to leave you much. Without really looking at it, I have no idea how much better the quality would be for either one. You could use cheaper plywood, but it would also tend to be more splintery.