Easy to Make Bench
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.
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.
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.