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Cut the desktop to length following the design (either 90 degrees or 45 degree ends).
Use the 18-inch remaining strips and rip to 2" widths.
Measure the back of the desktop and cut a strip to length.
Glue and finish nail the back strip to the underside of the desktop.
Measure the front of the desktop and cut a strip to length.
Glue and finish nail the front strip to the underside of the desktop.
Repeat this step for the sides of the desk. You may need to miter your cuts if your desktop design includes 45 degree cuts.
Put the table saw blade on 45 degrees and rip 30" stock down to 27" wide.
Cut to 30" lengths, you will need two 30" long pieces for each vertical support in your design.
Glue and nail the 30" pieces together so that the beveled edges are together creating vertical support.
With the table saw blade still on 45 degrees, rip 18" stock down to 1-1/2", beveling both sides of the strip.
Glue and nail the double-beveled strip onto the front of the vertical support.
Repeat this step for all of the vertical supports.
Find the wall studs. Attach ledgers to the wall at your desired height.
Place the desktop on the wall and measure and cut the legs, paying attention to cut around any trim that is not removed from the walls for a flush fit with the walls.
When adding a computer shelf, add supports for the bottom shelf to the legs. Set the shelf in place and secure it with finish nails and wood glue.