They will give you beam at deck level, depth of hull, and angle of bow and stern, but you will have to guess at bow flare and vertical taper of bulkheads. You need to divide the hull into sections and plot the deck width and depth of each section. This will give you 3 points to join up, then you'd need to guess at the hull side profiles. You also need to find some way of holding the bulkheads verticall y in line - probably by cutting a keel profile and slotting the bulkheads into it. You could certainly build a model, basing the unknown bits on plans of similar vessels, but it would almost certainly not be a true scale model. If this bothers you, don't build it. If however she is a pretty or interesting ship go for it - you can't be too far out, especially if she is a displacement craft. And if in the end some rivet counter says "that's nothing like the HMS whatever", you say "that's ok - HMS whatever looks nothing like this".
Damn the torpedoes!
