They're ultra-survivable! :'D
I've totally been meaning to, and show some different vehicle types as well because there are some pretty big mechanical differences that very much reflect in the biomechanical part (for example, since aircraft are ultra-light for their size, an aerosaur actually uses a lot of hollow low-density structure and pneumatic systems for most movement.) That'll probably have to wait until I'm out of school though, I barely have time for personal art :'D
If you actually have questions though you can note me for more detail on these guys, I have walls of text scattered about somewhere with stories, structural notes, etc :V
And there actually is a story around that! The first big introduction of these creatures into human uses was WWI with dogfighting aerosaurs, haha. These started showing up as civilian vehicle types as well, bu they prove to be difficult to control and are generally not safe for the average person to be around, since they're somewhat aggressive in their nature. A lot of experiments are done during the cold war period where humans tried to advance these guys as their personal weapons, and do things like cut out the processing unit and transplant them into human-built machine bodies, but that failed in most cases (it either didn't work at all, or the machine took over the new body and converted it into living metal.) Studying how they work does advance human knowledge and computing sciences and so they eventually built AI machines - human-built "living machines" which are pretty much robots, they're easier to control and are most common among civilian machine types (and don't have weird abilities like the shape-changing nor do they express much biomimicry,) but the original Vattir-types are still used and experimented on, with drastic results (long story short they eventually develop into a self-sustaining race instead of being part "built" machines and pretty much take over LOL!) There's all sorts of other stuff like rogue machine clans and the entire machine-hunter hunter thing where humans try to purge Vattir-type machines by turning them against each other but it all ends up in chaos.
[ and that's just one of the three main headworld settings! ]
I would agree though, these creatures as pets/companions would be friggin awesome!