Albie,
I'm sure someone will correct me if I'm wrong but I don't think that the MIL 707/E3 sims are up to FAA standards for a ATP check due to the fact that they don't have circuit breaker panels. Again I could be wrong about that.
If your contact is on the east coast and want's the name of a good EP that can knock out his ATP in a day if he's up to speed PM me.