Small CQ: You can read about it
here in the entry dated 2401.2 but in a nut shell it is a 10kT system which provides life support and crew quarters. Are you adding life support on top of the Small CQ? Shame on you, didn't you notice the warning for life support and crew quarters disappear when you placed the Small CQ? Anyway there is no need for a small LS hold.
Magazines count toward the cargo space requirement but they do not provide cargo space for storing items. They are magazines for ammo only. The key here is "A Magazine counts towards cargo space
requirements." That means that a player can build fleet colliers without having to spend valuable tonnage on cargo holds to meet the requirement on freighter hulls.