You can get all the ankheg shells you like and sell them to the smith. You should still be able to commission the armour (you need another shell for that, but there are plenty).
Once commissioned, you cannot sell any more shells. You also have to wait for ten days of game time before the armour is ready and you can pick it up.
The Nashkell armour is completely unrelated to any of it.
Usually, you are better off selling all shells and saving for the full plate mail rather than getting the Ankheg armour. The latter is enchanted, which makes it far less useful (although the lighter weight can count for a lot).
|