considering putting a merc 25 4 stroke jet on my inflatable,raised floor. they say it requires a transom of 20" on the 25 but does any one know what the actual dimension is from the top of the transom mount to the leading edge of the intake. i wont be installing a jack plate and want the shoe as high as possible,perhaps right on the surface? also,is there a perfect angle for the intake to meet the water? if the angle was decreased it would run shallower. it figure that on plane i would be able to travel safely in a few inches of water. anyone been there done that?