Old photo showing hatch design

I found this old photo of my Mom and Dad Teardrop camping circa 1953. They borrowed a homebuilt from a friend that can be seen in the background. I like the way the builder did the hatch. Seems like a simple way of making a strong hatch that would be less prone to leaks, with less reliance on weather strip to seal the hatch. I think I have seen Steve F use this same overlapped hatch rib method along with epoxy wood channels to keep water out. Have any of you constructed hatches this way?
