Good point Silver.
I've thought about something similar myself. I've now got this strong aluminum diamond plate roof and reinforcing rails, I've removed the plastic fridge roof vent, but I'm still left with those plastic hatches. And I'm always squeezing and scraping through trees, so one day I'll lose a roof hatch.
When I do though I suspect I'll fabricate something out of the same thickness of diamond plate aluminum I used for the rest of the roof (I'm too tight-fisted to pay for an off-the-shelf one). I'll probably wait until I smash the existing one though as I just don't have the time to pro-actively replace stuff in case it breaks.
Steve.
