strick,
Nice work! I like your idea for the two panels where the plywood bulkhead was exposed. I'd like to place an order for a pair for mine.
I think it was a very good idea to add riser extensions to your motor. It sits pretty deep in that deep vee hull. I don't know the spec for Volvo, but Mercruiser wants the top of the riser elbow a minimum of 13" above static water line with the boat fully loaded and you need at least 3" riser extensions to get there.
Dave