Dog Kennel "Ridge Tile"

First of all thanks for all the help with my earlier post on dog kennel construction - it really did help.
The kennel is now built apart from the removable section of the roof and I need the dog kennel equivalent of some ridge tiles to waterproof the apex of the roof.
It will need to be removable (or at least a section of it will) so I was thinking of two strips of plywood but-jointed to make a 90 degree angle. This would then sit on the apex and I would fix it with a bolt at each end with the nut epoxied into a kitchen door knob or similar.
Can anyone think of a better way of doing this? Rain permitting I will be doing it tomorrow.
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