This project only takes ONE sheet of plywood.
Ok, maybe it wasn't EXACTLY $20.. but $20.54.. sorry. But this is a trick I've used a few times, Find some plywood at your local home goods store thats got some defects / scratches / chips and offer to take them off their hands for a discount. Chances are you can get them pretty cheap.
This is super simple project, but if you think plans will help you, I made a set available on my website.
Step 1: Breaking Down Sheet Goods
This is always fun, I like to use a combination of track saw / circular saw to break it down into smaller more manageable sheets. A little trick here is to use a piece of hard foam insulation under the saw so it supports the sheet on both sides and prevents binding.
Step 2: Tablesaw Time
Finalizing all the sizes on the tablesaw, there was a lot of 4in strips cut! I like to use those board buddies to keep the plywood up against the fence. Saves time and is more safe!
Step 3: Drilling Lots of Pocket Holes
To keep it simple I used pocket holes for this project. I added 4 pockets for each leg and 2 for each corner of the top and bottom support.
If you like that Kreg Pocket hole station, I have a plan for that too.. <-- Always selling lol
Step 4: Gluing Up the Legs
This is a super simple leg design that you can't really get wrong. Both sides are 4in so just glue it up and sink in those pocket holes.
This is also a good time to sand before you assemble the whole thing.
* Note that you only need 4 legs... I made 2 benches :D
Step 5: Assembly
You can put the top and bottom support anywhere you want, but I those to make them both exactly the thickness of the plywood. This will allow for a flush top when it's all put together.
Step 6: Fully Assembled, Adding Wallcontrol
This is totally optional but I added my Wall Control kit to the side and it fit perfect! Almost like I built it to fit :D