Even if someone would be so inclined to release source files, they can't at the moment. A MAX file is not an acceptable file format and a ZIP of one is still too big for the file limits. My smallest aircraft MAX file is still nearly a MB and only zips down to 220 KB.
If the file limits can be amended, I'd be willing to donate the source files for the first plane I ever did for Real Flight. I don't consider this plane to be up to my current standards and so it hasn't been posted to the new swap pages. In fact, the only way I would post it would be to redo it from the start.
So if there is a way it can be posted, you can have it.