I'm making a plywood box with shelves...that's basically what it is. Box will be 26"w x 24"d x 14"h. I will be joining the plywood pieces with simple butt joints. I don't have access to a biscuit cutter router or even a table saw, so anything better is out. I'm using 3/4" plywood. What would the best screws/length/diameter be? Drywall screws? Sheet metal screws? Thanks.