[quote=Silvir]
I just mentioned the mostly used types of classifications. Since you said logic and realism...A support class is called so because most mechs in that aspect where mostly just put as light fire support for infantry or tanks. in many sci fi stories. Also this size is often seen in industrial zones rather than on the field. It's not restrictive, merely a logical stand point on where they would see the most use depending on technology and combat abilities <.<The strength in having a mech. A humanoid robot is that it's adaptive. usually the best size would be around a fighter jet where you can get enough performance and protection at the same time in it. thus the second class description. When you said fleet bound i imagined nomadic types of nations XD Having a space fleet that moves around taking resources from asteroids moons and perhaps even planets. yes resources is not that big of an issue as you make it sound ^^ If as such that kind of species would have generations of people just living in space learning how to handle zero go. Technology would develop around vacuum, danger of debris and hull ruptures even space combat in majority. AKA they would have the edge in having the most experience in space travel and survival. in both technology and experienced crews but yes then it also depends on how long and what turn their nations development would take after space travel starts. Stagnation or flourish....might make a nation today ....hm have some things to do first though.
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On Mechs: Not really Support could be ranging from anything in cover fire, like increasingly large machine guns, to artillery. Or be support in the way of infiltration or rescue.
That's not really 'realism,' more so, the average, and, the average of human beings.

So you like chemically-created water? And resources would be a serious thing. Asteroids only have certain types of resources in each cluster, this isn't some computer game where the resources are always nearby. Asteroids aren't that common. Look at our solar systems. Clusters of asteroids are not as much as a forever-unlimited farm. You'd have to continuously travel. Building or repairing your mining ships, and damages do occur. If you want a nomadic Nation traveling, alright then. But let's just hope you have enough resources for your people and to keep your ships sustained.