As mentioned in the materials note, when looking top down at the holes, each cinder block has one side with narrower holes and wider edges around them (the nicer looking side).
And the other side has wider holes with narrower edges (a little scraggly-looking). Be sure to lay the blocks so that the wider side is facing up. This gives you more gluing surface.
Now take the construction adhesive and run a bead of glue around the edges.
Take care to place the glue a little closer to the inside because the glue may spill over the outside and be visible if you put the bead right in the middle.
Repeat on the other side.
Next, add two more blocks on top of the glued bottom blocks, on both the left and right side.
Again, be sure to place the wider side on top of the glue since it has more surface. The skinner side will be facing you.
Step 5. Secure The Seating Blocks To The Base
First, make sure that everything lines up before gluing the side-facing seating blocks to the base.
Take the four side-facing blocks and place them on each side of the base (holes facing sideways).
Get four of the 4x4s and set them in the holes to make sure the bench seating lines up straight and is level.
If everything looks good, then go ahead and glue the seat blocks to the base. Otherwise, adjust them first before gluing them.
When gluing these, do the same as in the previous step, but this time you can apply the glue to the narrow edges.
This is because the seating blocks above are laying on their sides so you have the entire surface for the glue to adhere to.
Also, be sure to have the wider, better-looking hole edges facing out, the narrow edges will face inward. This also becomes a nice little arm rest.
Step 6. Glue The Back Support Cinder Blocks To The Seating Blocks
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