I thought I'd seen everything at Cardiff Reef until this morning! A guy had an old longboard he was experimenting with... Carved it up, reglassed/resined with 2 motorcycle batteries under the deck with a charging plug near the nose and a button to activate a small motor (also under the deck). He scooped two areas on the bottom of the board where he installed two small propellers that were housed in a plastic tube in front of the fin. Yep friends, it worked about the speed of a slow paddle!
A few of the local guys who paddle out to the kelp beds on small summer days to fish were stoked... you have to understand thay have old longboards with crates and pvc pipes rigged on their fishing boards and spend several hours a day going after the sea bass, etc., in the beds.
Don't think it'll work in the line up