Agrees.... and it would help deflect the heat the metal will gather.I I think it would be high enough that they cannot reach it or get at it, but my main thing was to keep the condensation off the bottom side of the metal roofing. On the other hand however, that would block up the ventilation at the ends where the metal roof doesn't meet the wood on the ridges.
Losing the corrugation vents would be more than made up for from opening up that back wall.