I have never used this type of joint so I have a newbie question. I am making drawers for a tool cabinet I made a while back, I have the fronts (oak) and sides (Baltic Birch) cut to size and am thinking about the backs, I was going to use more BB and connect the sides to the backs with dowels. It seems that the typical dowel jig is meant to be used on the edge of a board, I am wondering if they are designed to make the holes in the face of a mating piece as well, but I will probably figure that part out once I buy the jig; What I really want opinions about is whether it makes sense to try to drill perfectly round holes in the edge of plywood. I mean, will the expanding dowel pin push the plies apart, weakening the joint? I wonder whether I should look for solid wood I have lying around to use for the drawer backs rather than using Baltic Birch plywood.