I used the original file and adjusted a few things then after I made it I realized that an additional swivel would make it better.
2- 5/16" x 4 1/2" bolts 1- 5/16" x 2 1/2" bolt 1- 5/16" x 1 1/2" bolt 4- 5/16" nuts 12-5/16" washers 1 1/4" course thread screws Gorilla Wood glue
I used 3/4" plywood and 3/4" MDF that I had in the shop. I put all the components on one sheet 24' x 24' x 3/4" plywood, the laptop shelve I used 3/4" MDF it measured 12" x 20" then added a 1 1/4' X 20" as a stop. I put a 1" diameter hole 3/8" deep in the laptop shelf to cover the 5/16" bolt head and washer on the top swivel.
Estimated time: 1 minutes