The drawers are very simple to make. First, cut the drawer bottoms from ½" plywood. Make them about 1/16" narrower than the distance between the dadoes and full length. Cut strips of solid wood or plywood equal to the inside depth of the drawers you want and cross-cut them to length. I assemble the drawers with glue and nails. Note that to store a 5" tall object, you don’t need a 5"-deep drawer – you just need 5" of headroom.
Google is probably the first place where most people would start searching for woodworking plans, but often the top results can be a mix of articles and how-to pieces that just aren’t detailed enough. Sometimes they’ll link to the plans (like we try to here at Lifehacker), but other times, they’re just showing off a cool project. There are better, more precise ways of finding what you’re looking for.