I'm having trouble finding anything online that meets my needs. I want to insert a skylight into my RV above the loft/sleeping area. The tricky part is that I want to have it open so that I can climb through it for roof access. Also, I want it ideally to be able to close with a panel so that no light enters. Finally, a removable screen would be nice so that I can let in air without letting in bugs. So I can't find anything to meet these 3 needs: Open completely to climb through onto the roof. Open with a screen attached to allow air flow. Close completely and block all light. Does anything like this exist?????? Thanks!