First of, there were two boxes of Kharadron Arkanauts crying to be bought.
We have a Command Squad...
...with Officer and Plasma Gunner.
A Platoon Standard Bearer (using old Imperial Guard Orderly bits).
The second squad to make up the Platoon.
This Squad's missile launcher uses a spare Sentinel missile launcher (at least I think that's where the bit comes from).
The first Squad I built waiting some undercoat.