Thank you! Yes, this uses the Mothership panic table.
Regarding Specializations, you pick one based on an expert skill you have. So if you have Investigation as an Expert level skill, you can pick something like Forensics as a Specialization.
Master level skills are separate, just more of a skill bonus to the base skill.
Hope that answers your questions! I’ve also got an update/revamp of this system coming out when the Panic Engine SRD releases later this year.