I just finished building the two raised beds we planned for this year. We plan to use this next spring and then build more, incorporating any improvements we think of after our first year of use. We still need to fill these, which should take about 160 cubic feet of dirt. More on that below.
The cost of wood is still so high that we used 2-foot by 8-foot sheets of corrugated galvanized steel for the sides and ends of the beds. I built the roof of the chicken coop from the same material.
Inside each bed are 4×4 posts in each corner and at 4-foot intervals. The corrugated roofing panels are screwed into the wood. I used the table saw to cut away parts of the wood, allowing the corrugated steel to next flush against the wood. This worked well and prevents any sharp corners. The wood protects us from getting cut while working in or around the bed. On the top, I added 2x6s and screwed them into the 4x4s posts. This resulted in a very stable platform you can sit on and lean over. Like the wood in the corners, the wooden ledge will also protect us from the sharp edge of the metal.