You also need to machine the recess (non-threaded area) where the prop threads onto the shaft by an equal amount to what you take off the rear surface.
Stare at it, it will make sense.
What did you do to seal the pump to the hull? Looks like cut-down pump ears and inserts for smaller bolts into hull, but can't tell if there's a seal or just silicone.
Very cool project!
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