I suggest that you build the splashwell for now and leave the sump alone for the time being. Hang the motor and even if you can't run it, fill the fuel tank with fuel or water (yes it's a pain to get it dry but it's cheaper than gas) and take your batts with you to the ramp. Launch the boat and see what your water level is with the boat loaded as it would be in use... check front and back.... it MAY be worthwhile to locate the batts in the bow.
After you find your actual water level you can decide how to proceed.
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