Taerom will offer you to buy an Ankheg shell if you have one. But you should say you don't want to sell it. Then he will offer you to make an Ankheg armour.
In BGEE it will take 4000 gp and 3 days for Taerom to make an armour.
Note that you can sell each Ankheg shell for 500 gp each. But if you have several Ankheg shell simultaneously in a pack, Taerom will buy them all for 500 gp. In order to make it right, leave only one Ankheg shell in your inventory (put others to the floor, for e.g.), speak to Taerom and sell it to him. Then take another Ankheg shell, speak to Taerom and sell it to him. This way you can more than compensate for a huge price of your Ankheg armour.
@Klorox But you should say you don't want to sell it. Then he will offer you to make an Ankheg armour.
And keep in mind that he will only offer to make a single suit. After that he will only buy the shells from you. So the most you can have is 2 suits of Ankheg armour in the game. The other one you have to find.
At least on my phone version of the game, he no longer buys all of the shells at once - they're now one at a time. I found this out by accident one time when I forgot to stash my extras in the barrel outside
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...unless you already have that
Taerom will offer you to buy an Ankheg shell if you have one. But you should say you don't want to sell it. Then he will offer you to make an Ankheg armour.
In BGEE it will take 4000 gp and 3 days for Taerom to make an armour.
Note that you can sell each Ankheg shell for 500 gp each. But if you have several Ankheg shell simultaneously in a pack, Taerom will buy them all for 500 gp. In order to make it right, leave only one Ankheg shell in your inventory (put others to the floor, for e.g.), speak to Taerom and sell it to him. Then take another Ankheg shell, speak to Taerom and sell it to him. This way you can more than compensate for a huge price of your Ankheg armour.