In most cases, state law dictates what fees (if any) can be charged by an Executor of a Last Will and Testament.
Can an Attorney in Fact Create and Sign a Last Will and Testament on Behalf of the Grantor of a Power of Attorney?
No. Only the Maker of a Last Will and Testament can sign the Will document. No person can be authorized via Power of Attorney to create and sign a Will on behalf of the Grantor of the POA.