Re: water flow
I have seen this set-up before where the raw water pick-up is transferred from the outdrive to a thru-hull fitting with seacock. IF you think about it (and your outdrive does not need the water flow for internal cooling, it makes sense in that if you had an issue, you have a means of shutting the ingress of water via the seacock (i.e. a busted hose or fitting).
The set-up would make sense to me on an engine/drive combo like mine,
a 7.4L Merc with Bravo 1. The Bravo drive has no water pump; the raw water pump is mounted to the engine and is driven by its own belt. It would, in theory, be simple enough to install a 1.5" or 2" through-hull to feed the raw water. Also, if you saw the plastic fitting on the inside of the Merc transom plate that the raw water hose attaches to, which is typically below the water line at rest, you might give the thru-hull/seacock idea a lot of consideration.
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