@OP That's how everything in SoaSE work actually. As long as the pre-reqs are queued up, you can add the things those researches unlock to your build queue. The structures/buildings will not start construction until their pre-reqs are met however.
You can queue up structures after queuing up the logistics/tactical planetary upgrade that would provide the room to build them.
You can queue up frigates and cruisers once you've queued up the researches that unlock them.
Also worth noting, if you're researching, say, Hoshikos and add a bunch of them to a build queue, then add some Gardas to the same planet's build queue, the Gardas will immediately start building even though they are later in the queue than the Hoshikos. As soon as the research for Hoshikos is complete, the Gardas will stop mid-construction and the queue will restart back with the Hoshikos. When the Hoshikos are complete, the half-finished Garda will resume where it left off.
