@Chris85- here is a unit tree (i think) for the Yuuzhan Vong (not including the ones already mentioned by odintheking which are the Razor-Bug Infantry, Amphistaff Warriors, and Coral Implant Slave)
Rakamat- "light" AT-AT sized walker, only with six legs. Like all YV units, is organic and resembles an insect (from what I can tell- no pic yet). Launches powerful plasma ball from its mouth. Is a light walker because because YV have even bigger ones.
Fire Breather- Heavy Walker has 6 legs and a bladder shaped body which produces pyro-chemicals which are shot out via a long proboscis. The Fire Breather is also protected by more symbiotes that secrete anti-laser aerosols into the air.
Coralskipper- the primary space superiority fighter of the Yuuzhan Vong. Main weapon is a kind of small volcano throwing small molten rocks. They are strictly space vehicles and perform poorly in planetary atmospheres, and are also not designed for long-range travel and must often rely on larger vessels for transport. For a pic go to:
www.thecustomalliance.com/ mills/default.asp and it is the ship on the left.
Grutchin- a bioengineered weapon that resembles a giant grasshopper and is designed to tear through ships and kill the entire crew. Can be a missile/torpedo in mod.
Yorik-Stronha Spy Ship- a bioship that resembles an asteroid and is used as a spy ship. The Yorik-Stronha is sent into enemy territory before the attack fleet to spy on the enemy. It is equipped with a cloaking device- could be a scout unit.
Yorik-trema- The Yorik Trema are troop transports capable of deploying 30 Chazrach support troops and 6 Yuuzhan Vong warriors to a planet. The Yorik-trema resembled a gigantic bulbous, green eel with a tail-like aft and two 'eyes' above its volcano cannon which was located in its mouth-like opening. These so called 'eyes' were actually Yuuzhan Vong sensors which could be used for tracking both enemy starfighters or its escort coralskippers. Transport (obviously)
Koros-strohna World Ship- Super-ship, battleship + transport, 10 km long. Its main body is a disc-shaped bulk littered with hundreds of weapon projections and other protrusions. On the edges of the Worldship are several large spiral arms, causing the ship resemble a galaxy. These spiral arms or outrider ganglia were used to dock the worldship's Coralskippers. They can also be used as solar sails to push the worldship through space. Carries 200 plasma cannons. Heavy Battleship
Uro-Ik V'alh- carries 80 plasma cannons, Cruiser
Tsik-Seru- organic vehicles used by the Yuuzhan Vong as atmospheric fighters/speeders. Resembles a manta ray with a few, short tentacles, heavy armor, and plasma cannons. Repulsorlift
The only problem is that these units very rarely have good descriptions or pics associated with them, and the biggest challenge in making them is finding out exactly how they look like. I think it would be best to leave the Yuuzhan Vong civ and units for last after having completed all the other civs. Let me known if there are any unintentional unit tree deficiencies in any of the other civs- not enough fighters, walkers, etc.
, but not a consenses or group agreement- just to get this straight- is there going to be a 6th civ called the New Republic? Again, it wouldn't be too hard to make- it would just be a combination of Rebel and a few Imperial units and it would make a lot of sense considering they are the ones to fight the Yuzzhan Vong. In short, we wouldn't need to make any more extra units, and the only thing that would require any extra work would be the Chief of State Leia Organa diplomacy figurehead.
, but it wouldn't make sense to have the new republic in YV headed by Mon Mothma and without all of its units. She gave up the position of Chief of State of the New Republic to Leia Organa Solo only a few years into its creation, and died well before the Yuzzhan Vong invasion. I hate to bring the discussion back to scenarios (only briefly, then im off that topic for awhile- i agree w/mrkingkong, odintheking, and pretty much everyone else, scenario talk should be saved until the mod is done) but for the Yuzzhan Vong Invasion scenario it wouldn't make sense to have the Rebels under Mothma fighting them- a new civ makes more sense than a civ controlled by a dead figurehead. So, yeah, i guess right now it'd be ok to put that discussion off. 
