There are a few flat bits!
Seriously....
Starting at Kite Hill, the route "undulates" between here and Cowes, with a couple of sharp climbs.
From Cowes there is a steady climb and then it again undulates to Freshwater
From here there is a climb to Blackgang (571 feet) then a long sweep and climb to Niton (420 feet) and Wroxall.
Then it undulates (all under 200 feet) back to Kite Hill.
The route I linked above will have elevation data once it is fully loaded.
PS - Montage - where are you based?
PM me if you would rather not make it public...