Hello Nicolas,
Here in the U.S. the list price for an FX hull is $3700. Add shipping from Hobie US to me and crating charge. They come from Europe wrapped in several layers of bubble wrap in a dedicated container, which isn't sufficient for a LTL shipper.
This price is a few years old, and with the decline of the dollar it might be around $5000 by now, but that won't affect you since you're in Europe. That is the most current pricing that I have.

How bad is the damage? Post a pic if you can. As my glass guy says "Every fiberglass boat can be repaired, depends on how much money you want to spend." The FX hull is totally accessible once you pull the decks off, which make elaborate repairs more feasible.