from 3dmax, just save as .3ds since Milkshape can import this type of file.
then you can create a directory to which you extract the textures from Mohaa with Winzip and save them there.
In Milkshape you can then assign any Mohaa texture to your model you just imported from Max.
then in Milkshape, you can export to Radient. And voil?!!!.
pretty neat.
No need for the quake3 importer or the max plugin.
by the way, i tried the max plugin with my 3dmax ver5.0 and it works, but it for skeletal work,not for models like buildings and stuff like that.
well, thats what i did for my needs and it works, hope it can be of any help to someone.