These should help protect the gelcoat when boarding the boat.

I made then out of 3/8" polyethylene at a friends shop a couple Sundays ago.

Another view

How did you attach those? It looks like there are four small screw holes.

6 countersunk holes for some stainless screws. They're not countersunk in the pic, but they are now. I was thinking I should have put the holes in the grooves....a little more of a safety factor if the screws decide to back out.