Mine was like you said, stringers on either side of the floor boxes.
Simply enlarge the drain hole from the inner bottom to the bilge enough to accommodate the hose(s) and wires and put the thru hull(s) below the rub rail.
Dremel tool or Roto Zip would be an easy tool for enlarging the hole. I did mine in a half moon.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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