DIY multi-purpose Garden bed Box
Step 5. Prepare and mark the opposite side
Unclamp the boards.
Get two runners the same thickness as a board and longer than 2ft. Make the eight over 2".
Turn the boards over and have the trenches sit over the runners i.e., the two runners will be in the tenches.
Clamp the boards together, and when positioning the clamps ensure there will be enough free area to work the power saw when making multiple cuts across the cut-out area (yet to be marked).
On the sides, mark square lines up from the trench below and from there mark the cut-out area across the top.