Wanted a super sturdy work table for my son, so decided to try this simple interlocking method.
I used 1×4 whitewood planks from Lowe’s, but 1×2’s would also work well (and be much lighter!).
With a good orbital sander, you can easily round the edges as much as you want. I decided to leave the wood raw, but stain/poly would give a more polished look.