A few months ago, I didn't have a fully equipped workshop yet. I only had a drill and a miter saw. I needed a bench so I started thinking how it could be done without needing to cut a big wooden board.
In the hardware store of the town, I found some wooden boards ready to use. I designed my bench combining four of those boards without any modifications. Thanks to the bottom one, the construction is very stable.
Step 1: What You Need
If you can find every piece of wood you need pre-cutted in a store, you won't even need a saw.
Step 2: Construction
Start the construction on a flat surface. You can press the parts against a wall to keep them well aligned.
Make sure the screws you have are not to long and won't go through the boards.