kellan_the_tabby

From:

That I know how to do.

Build a frame that is about 2-3 inches wider and longer than your hole, out of 2x1 with one on the edge and one nailed to it flat so it makes a sort of L shape in cross section. Slot poly carbonate or glass into that. Apply copious amounts of silicon calking. Then nail another layer of 2x1 ontop so you sandwich the glass or poly carb in a square C shape.

Then build a frame of more 2x1 that fits inside of the hole, nailed to the roof and projecting up by the inside depth of your skylight. Apply sealant to the outside of that to fill gaps between frame and roof. Thus you have slight projection all the way around and a skylight that fits over the hole. [and water doesn't run uphill usually]

The complicating factor I can see however is that you have a curved roof. So you'd need to build a square box to project through the roof. I suspect you need to do something with battans and plywood to essentially make box open at each end, with the skylight screwed to that and capping it.

But I built basically that so I could get up through the front half of my workshop roof and access the solar panels if necessary, or just let a breeze blow though when the forge is running.