just retexturing is what your told? ;D
Well you can make your own unit model aswell if you want, and texture that?
In which case you need O2 which you must of heard mentioned
http://www.flashpoint1985.com/breathe.
also d/l buldozer from there also.
So I guess you a Noob to modelling aswell?
Okay if you want to be modelling in O2 then try out some of the tutorials for it you can find, Abuu has one on here (ofpec).
There are also a few over here
http://ofp.info/brsseb/ by brsseb. There good for getting you started, also there are some Demo models that you can look at/use in O2 that are very helpful.
http://www.geocities.com/kungtotte/most of them still need x-packing (thats a tool you can also d/l on here (ofpec).
Also when you have memory points/selections its in Czech, but if you grab these translations by a_lone_wolf it will help alot.
http://web.quick.cz/fholesinsky/OF/cz2en_05.txtif you have no idea what I mean by memory points and selections, dont worry you will soon enough.