We had a cheapo tv stand made out of pressed board which I felt was one nudge short of collapsing. So decided to build an upgrade. There were a few electronic components I wanted to be in the middle so designed a 3 bay instead of the 4 bay originally posted here. I used the picture from the sliding door hardware tutorial site - but instead of joining the plywood box with kreg screws I instead used Spax MDF screws on the end grain + wood glue (they work great and don't split the plywood at all - no need to predrill either!).
For the shelves, I drilled a buncha pin holes in case I wanted to adjust the height. For the top I used 3 2x6's instead of the 1by used here.
With the backing, I used scrap planks from a couple pallets - I spaced them at about 2 inches to allow airflow for the components (HTPC/ PS4/ modem) as well as the ability to run cords through.