I was looking at how you are proceeding with this game and was looking at your UGV concept. I wanna say a few things about your concepts. First of all your UGV is focusing around the combat role of some small scale tank. I think there should be at least two types of UGVs. A "tank" UGV wich has heavy armor and is more about outfighting enemy, and a fire support unit with a less armor but fairly higher firepower. I also started to make models for UGVs. Would like to help a bit with them.
My ideas about UGVs and UGV combat:
1.: there should be two categories of UGVs the current ares model wich is highly mobile and has a tall armored hull. So soldiers can hide behind it. There should be the other model of the chimera, wich is a fire support platform. Also there could be lightly armored and armored fliing drone in similar size(like a miniature chopper). Wich could have lightest armor and weaponry but can give a lot of vision.
2.: The UGVs should have a lot better aim and cause of the turrets they don't have to turn, so faster firing/aiming should be possible. The turets should be small, cause there is no need for space for humans. Also most weaponry can be belt fed(there are belt fed guns wich can even change ammor type). Also ammo racks should be under the turret rotating thoghether with the whole turret. Hovering systems also do not need turret they can traverse the whole hull fairly easier, also recoil and movement of a heavy turret would make the hovercraft more unstable.
3.: Ares should have options of mounting multiple types of turrets and weapons. It should be able to equip a 50mm single shot cannon or rocket launcher against other UGVs and fortified positions, also with the ability to fire HE rounds. This turret should have a coaxial MG simple with 4,7 mm ammo. This should be a standard configuration. Alien tanks could only be damaged by explosives and this cannon efffectively. There should be a turret with the 12mm Rotary cannon just against soft targets. Also you could research more weapons like this. e.g.: A laser weapon wich eliminates the need for two separate guns(making the turret smaller, or better armored), or into a combination of a high yield plasma cannon and a rapid firing laser weapon.
4.: Chimera UGV should always have multiple weapon systems. With lighter armor larger turret mount it should mount a more deadlier weaponry also could be a little bit faster. It should have a starting turret with a 12mm rotary cannon for direct fire support and a 25mm belt fed grenade launcher for indirect fire support. There could be a variant with a 70mm mortar with multiple type of rounds( airburst HE for standard, gun launched armor piercing rocket against armor, semi armor piercing He rounds for the ability to attack enemy inside buildings, more advenced rounds could also be rounds wich leaves a mine at impact point. A third turret with a heavy longer range automatic 25mm grenade launcher also should be present(it would able to take 5 or so aimed shots not too far from each other or more but not really accurate shooting.). This platform could act as a light artirelly for the phalanx troops. For the large weapons there should be a 4,7 machine gun as a secondary weapon.
5.: For larger guns UGVs should have to select ammot type before each shot(simple for single shot weapons, dunno how to do for multi shot weapons like 12mm and 25mm GLs). Also GL for the UGVs should have larger effective range.
6.: UGVs should have 360 vision with the ability to detect aliens throgh walls if they are too close. Some aliens also should have thermal cloack so they wouldn't be seen through walls.
If you are interested in my concept I will post my done models too. I'm still working on them and they aren't ready yet.