Hi Jim and Martin,
I do not agree to use the normal loft as it will result in hours on fairing. Use the loose loft method means that some of the loft curves will be outside the final hull, pulling the surface to the required place. Only the last loft curves and maybe the midship section curve will be on the final hull shape. Loft the whole vessel at one go with record history on. Use less loft curves as is mentioned in the pdf tutorial Powerful Ship Hull Design in Rhino with Rapid Hull Modeling Methodology.
As the final shape should match the original linesplan , do the following: create ribbons (Rhino function _Ribbon) on some of the original curves, per curve one red to the inside and one green to the outside. Make the height of the ribbons a certain percentage of the breadth. Now you can play with the loft curves to match the ribbons.
Good Luck,
Bas Goris
RhinoCentre.nl