Can anyone tell me if there is any reason this model would get rejected?

[TGE]

You didn't fix the texture paths in the mtl file to be relative paths instead of absolute paths pointing to a file on your computer.
Simply remove everything that's not part of the filename itself to take care of this.
Curious note, your readme file is named Readme.txt.txt, it might help to enable display of known file extensions in the folder options to make sure these kind of things don't happen