Hey! I did notice the two monster guys. Also looked like there was a human in the pack once I started looking more. Im glad to hear you've re-aquired free time, as it is always nice to have.
As for recommendations. Vehicle wise I would say Tank, some type of APC, and then I was thinking some type of VTOL helicopter/plane for a flying vehicle. That would cover most fighting vehicles. For biological I think getting inspiration from something like the zerg or tyranids. Though dont need too many as it is mostly a game about fighting mechs.
As far as an infantry squad. They are size 4 so maybe just put a couple of your humans in a bigger picture to represent them as a squad. Worse case someone just dose that themselves. By having them hang out together in a size four base.
Also dont feel pressured to do any of this. Free time is precious so hope you have fun with it while you can. One last thing! I can report my first game of Lancer on Sunday went swimmingly. Though we learned hard, we need to focus fire and work together more!