I am a 3ds Max user, excited about gITF, and would be interested in contributing to an importer. Is your Creo View project by any chance open-source? Would your Max importer be open-source?
Writing an importer for those ASCII files is easy, and when you have the binary and ASCII versions of the same files side-by-side, working out the binary file format is made much easier.
I haven't even begun work on a 3ds Max importer.