I am turning one of my bedrooms into a wood shop. I have lumber shelves and scrap bins on one wall. I want to build an L shaped counter that is 6 feet by 2 feet on one wall and 8 feet by 2 feet on the adjoining wall. I plan to use 4 X 4 posts spaced every 4 feet, with 2X4x as the frame. My question is how to connect the 2Ă—4s to the posts. Would it be better to screw them all together, or cut mortise and tenons for the joints? If I use the mortise and tenons, the plywood top would actually rest on the posts, without any support from the 2Ă—4s. I plan on having a shelf at 1 foot high and the counter at 3 feet high. Any suggestions would be appreciated.