Here is my branch. I will improve commits and messages before PR, some commits will not be part of PR at all - showing the branch just as it is for now.
Have you managed the compile it without fixing case sensitive names? What about serial port, does it work for you? I had to fix all these things. Also the app crashes when it tries to show some gifs, therefore I replaced them by other gifs from the project (one of the commits not for PR).
Do you think it is possible to fix the geometry problems? It works in Wine, so I think it needs to be fixed in Mono itself.
I have raspberry with Manjaro and glxinfo showed accelerated driver, not software. And I do not think it will fall back to llvmpipe or so when it finds that some OGL extensions are missing. But I will double check tomorrow.