Looks really good and you can get away with a thin chopping board on top as it doesn't need strength. Those plastic rod holders will give you grief sooner or later at the speeds and bumps a ski will flog them I think.. They only last a few years in the sun as well. Put the extra screws in them as a start and watch them for cracks. When you have used it a bit and know what spots work change them out for stainless ones.
With that said get some rod lanyards or make some up not only teh bungy to hold em in. Too expensive to loose stuff.