I have it working and almost functional.
It is now the second worst Serial Terminal application I've used on a Macintosh.
I now need to work on the UI some more and file Upload/Download.

Download as a self extracting StuffIt file.
Warning!! This version is still buggy. I found lots of bugs in the displaying of the text from the serial port. I will upload a corrected version later.
It even has a creator type! I registered the creator type M10x just for this program. Not sure if that will prove to be useful or not...
I also managed to get my Performa 450 working again. I think it just needed to sit for a while. This is basically a newer version of the LC III. I made the modification to turn it into an LC III+. Basically move a resistor from the top of the logic board to the botom. It increases the speed of the system and makes it much nicer to use.