Hmm....
Well, I might not be much of help and I don't know much about the meshe's, but I'll still try to help chu. <3
Hm... I reamember downloading that Temple a long time ago and it was a marshmellow too.
Perhaps contacting the original maker of the mesh anmd discussing how to make it look like a temple and not a marshmellow temple? Hm?
Anyways, be sure that you added the .PNG .MATERIAL .JPEG .MESH to the my_objects folder and if it has a .OBJECT place it in Objects folder and then try?
Idk.
Again, I'm not so much of help.
Good luck thought! ^.^