HaloMods "Classic" Read-only Archive

I have a problem placing my "sky" into the 3Ds 6 box model. Whenever I try to place it in, it takes the map outline (from Paint Shop Pro 8 ) and places it on the "ground" and "sky". I've tried over and over to fix it but could not fiqure out what the problem is. Any answers to this?

make sure the material ids are seperate, and the texture is multisub

The material id's are seperate, and it is Multi/Sub Object; and still does the same thing.