To assemble the cabochons, work with one set of beads at a time. Place a small amount of e-6000 glue on a scrap piece of paper. Separate the beads into rows. Use a toothpick to place a small amount of glue between each the beads in each row. Try not to use so much glue that it squishes out the top, but still enough to hold the beads together. If this happens, leave it alone. It can be more easily removed when dry than when still tacky.
Place glue between each row and gently push the rows together. Notice the glue squishing out between a few of the beads. It can be pulled off after the resin backing is applied and the glue completely set in a day or two. Line all the beads up as deired, trying to keep the cabochon a square as possible. . These beads are not calibrated, so are not all exactly the same size. Do not worry about that, but push the beads tightly together, squaring up the pieces as much as possible.
Since all the beads are likely not the same thickness as in the photo on the left, it is necessary to make the tops of the cabochon beads flush with each other. Place the cabochon right side down onto a stiff surface, here an index card, and push all beads down so the top of each bead is flush with the table surface. Carefully check both sides of the cabochon, realigning the beads and pushing them together as needed. Finally place it top down on the card. Let the glue set at least overnight, 2 days is better, before the next step. Hint: Carefully move the cabochon around a bit to make sure it does not become glued to the card. Notice the hole in the pink bead on the right? This was a third hole in the bead, so it would not have been usable in most bead projects. Perfect for the cab because the extra hole is on the bottom!