I found it much easier just to use the actorx plugin and "axmesh" command (in maya 4.5 or 5)...i did use the script first for the ple version of maya (shipped with game) and it worked oki except for the textures had to be flipped first horizontally an vertically before they mapped oki in unrealed.
Also using the script method you have to then add the texture to the mesh in unrealed by pointing to where you have put your imported texture...with the axmesh way it will appear textured right away in mesh browser if you have imported your textures previously to that of your mesh (if named properly).
Then theres the scaling thing although you can add to the script to tell it to multiply by sixteen to get scale right at export (even though you scale grid in maya as ueds)....and also this not a prob using the later method as it will scale to your grid settings correctly.
Hope that makes sense as i was previously making 3rd party levels for ut2003 but havent in a good while now.