Heh, i'd love to work on a spring based race, but i'm kind of a control freak and i'd want things to be included that not everyone might agree with.
my idea: more conventional styled units with more conventional layouts.
Tanks:
Medium Tank (Stumpy, Raider): Main Battle Tanks equipted with high performance Gauss guns, turret mounted Gauss-Machinegun.
They will be superior in firepower compared to Arm and Core tanks, but will be more expensive and slightly less armor than a stumpy.
Light Tank (Flash, Instigator): Plasma shell tank, instead of having a weaker fast firing weapon, this unit will have a slow firing high area damage, low damage plasma warhead that can strike multiple units in 1 hit.
SAM launcher: could be a C&C generals style Quad Cannon or a direct counter to the SAM launchers.
K-BOTS
Infantry (PeeWee, AK): Small Gauss rifle carrying powered exo-skelleton.
Rocket (Rocko, Storm): RPG launcher, less damage but higher splash damage.
Artillery (Hammer, Thud): Rocket Barrage, fires quickly, but is inaccurate and does less damage per round than a plasma shell.
SAM: Either a Gauss cannon complex or a Stinger style SAM missile.
Aircraft
Scout (Peeper, Fink): High Performance UAV
Fighter (Freedom Fighter, Avenger): Gun Fighter, nuff said

Bomber (Thunder, Shadow): Cluster bomber, less damage but larger delivery and spread radius.
Transport (Atlas, Valkyrie): Crane helicopter, slower but better armor.
Ships:
Scout (Skeeter, Scout): Machinegun and SAM launcher
Sub (Lurker, Snake): fires faster but does less damage, has medium armor
Destroyer (Crusader, Enforcer): Similar, may have starburst missiles instead of a cannon?
Transport (Hulk, Envoy): Landing ship style
These are only level 1, the Commander might be a vehicle or even an aircraft or a different aproach on a K-Bot commander?
this is how I would like to see it, the unit lay out will be much more like SupCom and have their looks lend from Modern weapon systems.
What do you think? should I continue the list?