I went 27in high from the keel and 27in wide, plenty of room for a 2005 suzuki 4 stroke 140.
With a permatrim to aid in slow planing and engine mounted on the last hole (4 up I think) which means I could have put the transom at 30in if I wanted to, but my boat is funky and beats to it's own drum. 1969 20fter
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