The start of a nightmare

I'm having a bit of trouble with texturing the track. From a distance it seems fine but up close it's really pixelated. The problem is it's reallyyyyyy long, but really thin in most places. I'm not quite sure how to, for example, make the UV's 1024x256 (They have to be to a power of two for them to work in UT3).
To help me with texturing a bit more though, I found a dvd I bought from 3d-palace.com. The DVD was on how to create the ED209 in low poly, high poly and import it into UT3, but I also got another DVD with it about creating a character for a game. It has some really nice tutorials on how to unwrap UV's, so currently I'm working my way through that.