This is outside my expertise, but the two suggestions I would have is that you are going to have trouble doing the hull as a single surface, you should do it in sections. Also, there are some hull details that break from the general hull shape. Model these separately and then add them to the hull.
Hello Clark,.. as Matt has said,.. this is quite the challenge... and Matt's suggestions are correct.. do sections (mid, rear, front, bow, stern,..for your boundaries or lofts),.. don't try to do this as a all-in-one-loft/boundary.
First suggestion.. imho,.. only do 1/2 of the hull, then mirror later.
Looking at the data,.. the sections are not aligning with surface trimmed edges (image attached showing top deck.. and you would need a bottom keel).. this is important for your boundary/loft to work.. they need to make contact to flow.