I am currently working on adding Matlab version 4 format support (read only) to this project, but wanted to make sure no one else has progressed along this path before I sink too much time into it. If I do go ahead, I hope I will be able to contribute my code (and tests, of course) to this effort. My ultimate goal is to provide a IOSP wrapper for reading Matlab via Unidata's Common Data Model. Not sure if that is appropriate within this project, or if it should be a stand-alone project.
Turns out that adding Matlab Version 4.0 read-only support was pretty simple. Working on tests now. Let me know if I can commit my code.