You might be surprised as to how well the hull will hold up, depending on how thick it is. However, you can always back the ribs (frames of the penetration windows_ with some 1/4" square birch epoxied in place. I would find the closest local club and ask their advice (and see how the penetration windows are done, and getting the cuts pre-certified by the Technical Officer). One thing to keep in mind, 1/142 is a bit large to begin with. By the time you add skinning, you might be over the 5% variance that some clubs allow (some clubs only allow a 2% vairance).

Just out of curiosity, what ship did you find?

Wreno