I contacted the owner of the funky beach wheel design in the photos I posted earlier and he was happy to share his ideas with us.
1. Holes are drilled at either end of the drum for the pole.
2. Cut circular pieces of the plywood with holes in them as well. This is for the added support on the drum.
3. Slip the pole through the drum and center it.
4. Take a 4" long piece of PVC pipe or fitting and slip it over the pole. Slide it down the pole till it has a 1/4" gap between the PVC and the drum. Screw the PVC to the pole with four screws.
5. Repeat the last step for the other side.
6. Now set your Hobie on the pole and drill two holes - one at each pole end outside of where the hobie is sitting. This is for the rope that will be attached and then looped over the hulls and tied back to the bar, securing the Hobie to the dolly.
7. Lift the hobie and off it will go. For added weight on the soft sand add water to the barrel. Not a lot but enough that the barrel will roll instead of sliding and becoming a plow.