I included a link to the free plans at the bottom of the post.
STEP 1 : I cut the plywood to size which was the following
2 Pieces at 4” wide x 36” (front & back pieces)
2 Pieces at 4” wide x 36” (sides)
2 Pieces at 4” x 26” ( these will be used with 24’ pipe clamps)
STEP 2 : I marked out where the half-lap joinery needed to be placed so I measured 1” from each side of the front/back parts then using a piece of scrap of plywood marked the position of the lap joint. To avoid making any mistakes mark out the waste for the lap joint ,on the front & back the lap should be removed from the top. The side pieces should have the material removed from the bottom. I could of used my dado stack in the table saw to remove the half-lap waste but 4 only 4 cuts I decided to just leave the regular blade in the saw and clean up with a chisel.
STEP 3 : I needed to add the “V” notches to hold the bar clamps in place.
To do this I tilted the saw blade to 30° and lowered the blade to about 3/4” high and made a pencil mark on my miter fence to determine where the starting point of the blade entering the work-piece and then made another adjacent mark about 7/8” away from the other, this marked bot sides of the cut, thus creating the V. I spaced out each V about 5-1/2” away from each other and I got this measurement by laying out 2 bar clamps next to each other to determine what space I needed so as that hat the clamp handles could rotate freely to tighten the clamp without bumping into each other.
Basically that is all you need to do, I posted pictures below to show some of the features of it and I actually got to use it today for another Project that I am working on “The Craft Beer Flight Project”