So.... your map is always going to be running on Mat_fullbright
1! PLEASE say I misunderstood what you just said. I
Clearly you did. On the breakship map that I sucked it up and
made entirely out of brushes already, the func_breakables have
cast and recieve shadows off. That means they are lit by the
world direct and ambient light with no shadows from other
objects. That is not mat_fullbright.
If you look at the new ship model in game pic it is not full
bright. It is vertex lit which IMO looks better with the curves
of the ship and sails. Since models can't cast shadows onto
themselves, the net effect is the same as the previous map.