Go to your local Big Box hardware store (Home Depot, Lowes, Menards, Ace, …). Find a nice employee in the lumber section and ask for "Four cheap two-by-fours, and someone to cut them for you". Getting the boards cut in store saves you time,...
Have them cut the boards for you to these specs:Board #1 and 2: 20.75", then 20.75", then the remainder should be cut in half (will be 27.25" each, minus whatever is converted to sawdust)Board #3 and 4: Just saw these in half: 48" long.This will give...
Screw them together. See the Sketchup plan (attached). The 48" boards are obviously the "rails" and support posts. 20.75" boards should link the rails together to form front and back panels. Squaring things up may be a challenge,...
Add your gear. Use more wood screws to secure faceplates to the wooden posts. For small items like cable modems and wireless thingamajigs, you can put wood screws into the side and hang them (most of these have special slots, as if they were......