How you gonna close that door?
I'm assuming that "A" your back in the
water, and "B" those two white hoses are what you will be attaching to. It's a bit hard to tell by the pic what clearance you have, but how about a straight fitting pointing upwards from your
thru hull and install the 90-degree fitting on the white hose and loop it over to the
thru hull. You may have to trim back the white hose a bit to make the hose curvature but from what I see you do have some room to trim it back. Just a thought.