To be honest, most of the models are done. Currently, the Halo UTM needs;
A Banshee - which Fingolfin is doing
A Drone - which Goolygot is wrapping
A Phantom - which my modellers are working on
and an unassigned Wraith.
So, basically there would be only 1 item on the list; the Wraith. Can you make the basic shape of the Wraith? It is symmetrical and basically has 5 bits; the middle, the left fin, the right fin, the top and the engine. You don't have to make the texture or anims, I can do that for myself. You also don't have to make complicated structure. It is a vehicle, and if you Google Image it, you can see it is just a solid purple tank.
So, awaiting if you accept. If you do, I will give you more details.