​RE: Leaking Skylight
Easy to open up, all screws are obvious.  And there are metal parts in the
lifting mechanism.  You may be able to see diagrams on one of the vendors
websites, try Bus Depot first.

And the only leaks I've ever had were from the screws that hold the
skylight to the top, try tightening them. BUT not to tight, you can crack
the edges of the skylight.  Those screws should have a small amount of
sealant on them.