Helping out fellow researchers is never sharpshooting, in my estimation. I always appreciate corrections and additions.
I had Military Prison at Little Rock as well, but a descendant directed me to an Ancestry.com collection U.S. Civil War Prisoners of War Records. If you have access, it is at the bottom of page 24691 out of 54896 on a page listing Confederate Officers confined at New Orleans. I have also seen him on a page for Little Rock. I'm not sure how to reconcile this.