First, build 4 leg assemblies. Attach the 1x4 boards to the 1x3 boards using wood glue and 1.25” brad nails. You will make 4 identical assemblies.
Next, build the two shelf assemblies. Attach the longer boards to the shorter boards with wood glue and 1.25” brad nails. These will be identical in size.
Attach the first shelf assembly to all 4 leg assemblies. These will line up flush with the ends of each leg. Attach them using wood glue and nails through the inside of the shelf boards and into each leg.
Now attach the other shelf assembly to the top of the legs. This will also be flush with the ends of the legs. Attach them using wood glue and 1.25” brad nails through the shelf frame and into each leg.
Attach the shelf boards next. These are 1x4 boards that are spaced 7/16” apart. Attach each board to the top of the shelf frame using wood glue and 1.25” brad nails.
Attach the decorative diagonal pieces next. The easiest way to get these cuts perfect is to lay them in place and mark your cuts with a pencil. Then, adjust your miter saw to make that exact cut. Attach the boards using wood glue and 1.25” brad nails.
Cut and attach the foot pads next. These will give you a surface to attach the casters to. Attach each foot pad using wood glue and nails. Before adding the top, take this base and add the finish if you plan to have a different finish on the top like I did. I painted mine with black chalk finish paint. After it dried, I used the orbital sander with a medium grit paper to distress and rub off the paint to give it an antique look.
Final step is adding the top! The plans call for a laminated project panel. If you have trouble finding a panel, you can also use 1x8 boards like I did. Attach the top using wood glue and nails through the top and into the frame of the top. If you are using 1x8 boards, you may also want to run a few support boards in between the frame to help attach the top and keep the boards from warping. Then, use a sander with a fine grit paper to sand the top smooth before staining or painting.