Sounds excellent.
You send the file to me, ill do some testing for you and enjoy the plugin while doing just that
About permission, if the original developer does not respond, try to send the guys from MP for advise.
I think since you aknowledge the work and it is open source as it was you can share your version also as long as you do it open source also.
Btw, I am more then willing to help out with your project when things get started, I am a c# developer myself so I can do some debugging and stuff, I am just short of time.