Yes ,lots of good instructions! I discussed them today with the shipyard owner and have good news, mostly:

1) The foam aparently isn't a problem. One of his providers in Argentina has Divinycell and will ship truck (700 miles). Many thanks for all the sources indicated!

2) Realignment of the bow with the rest of the boat will be easier than I thought. The broken hull fell almost exactly in its normal place once turned upside down. Looks like the keel is ok.

3) He is familiar with the suggested techniques and says that his people can execute any of them. As you expected, he combined methods and added a few of ideas of his own.

We found a few other damages, all on the same bow, but not nearly as bad. Anyway, the current plan is the following:

1- Cut a rectangle from the center of the deck to below the end of the fupture on the inner float wall (the big rupture).

2- Use the opening made to inspect the inside and confirm or adjust the rest of the plan.

3- Patch the inside skin of the outer side of the float (smaller breakage), adding a longitudinal carbon batten between the two layers (windsurfer batten). He wants the battens to obtain more stiffness on the horizontal plane. On the vertical the keel and deck are far appart.

4- Laminate a one layer patch from the intact hull (waxed).

5- Remove the patch, clean the wax and laminate a second layer where the wax was, with two longitudinal carbon battens inserted between the two layers.

6- Clamp the battened patch to the rectangular hole.

7- Remove only the damaged foam and/or outside skin from the smaller rupture on the outer side of the float.

8-Glue new foam to the inner skins.

9- Sand, chamfer and clean the edges of the outer skin for the repair.

10- Laminate the outer skin (two layers), sand, coat and finish.

He'll do everything with epoxy/biaxial glass (but for the batttens). What do you think?
Cheers,