Just came across a great idea for low-cost opening ports. To give credit where credit is due, the idea came from Wes and Anna Kisting. On the Pocket Cruiser that they built for a honeymoon cruise, they used clear watertight inspection hatches with some mosquito netting glued onto the rim to keep out the bugs. I see from your catalog that you carry the clear inspection hatches (and that Wes and Anna were not the only ones to think of using them for opening ports). Still, I think it's a good enough idea to give it a bit more exposure.