Can somebody tell me how to get a differant skin for an object for a differant era? (I want a crashed Clone UT-AT in the CW's Era and a crashed Imperial UT-AT in the GCW's Era (I have made the UT-AT an object BTW)

Create a new layer in ZE for each era, put the UTAT for each era in the correct layer, Configure game modes so that there are conquest-cw and conquest-gcw or something like that, that load the standard base and conquest layers, along with the era layers.
Update req's and mrg's.

Dont forget to edit the lua where it loads the map and layers.

Also, open a space map in ZE. They do this with the ships.

Take a look at Dagobah - between the LUAs and the ZE world it's fairly easy to get the idea.

Since it's only a skin change, a better way to do this is to include the Clone UT-AT TGA in your world's msh folder, and create a pseudo-side with the Imperial UT-AT TGA. Name this side whatever you want but the Imperial TGA has to have the same name as the Clone TGA. Finally, just load your pseudo-side in your GCW era LUA (after the line where the game layer is loaded) and hopefully it should work.