your rock fly gave me a lot of ideas for the species. if you dont mind i have some questions.
the weapons of the flies could/should be fragmentation. the reason being is that corrosive spit doesnt explode but more like spread on impact this would work really well with fragmentation since fragmentation damage can target multiple places with one shot. the weapons could also have an emp effect to resemble the sticky corrosive stuff that the fly spits the sticky stuff would then disable the weapons rendering them impossible to turn or shoot (for a certain amount of time). im not sure about the emp thing, could be really interesting, i am however kind of sure about the fragmentation becouse it fits so well with the spit and slimey stuff.
another idea is a new fly, the queen
the queen would be the leader of a hive, she doesnt have much firepower on her own. but she breeds all the flys and therefore is the most important. she can call her children in battle. these are weaker then the rock fly children but are in bigger numbers. these are her main defense. also she could have a hangar bay to house some smaller rockfly types (fighters) these would be as strong as a frigate or so.
well that are some of my ideas so far, i hope you will consider them. im really eager to see these guys in action and i think this is your most interesting work yet
ironclads is my favourite total conversion and im happy to see it still growing.