Mike,
Have you thought of making a temporary vee out of glued up foam? I've done this before and there's nothing complicated about it at all. Edit: Not the temporary vee part, but using the method for other applications.
Here's the basic concept:
http://curedcomposites.netfirms.com/images/005.JPG Here's a more extensive project using the same method:
http://www.6park.com/enter7/messages/gvk21098.htmlYou just build up the layers for a rough shape, glue them together with 3M Super 77 spray, and rasp out the shape. Larger cuts can be made with a hot wire "knife" or even with an electric fillet knife. You would be surprised at how fast you can make a respectable piece.
Two potential issues I see for your temporary app. would be:
1) How would you finish out the foam? Fiberglass cloth with epoxy resin maybe? Maybe even the rubber undercoating type spray, or cheap line X?
2) How to affix it to the hull so that it wouldn't delaminate. No ideas on this one......
It might look a little 'Bubba', but may be the best short term solution. Actually if built right, it could be reusable.
Just an idea. - good luck.
Jonathan