The MAME emulation works fine, got it built and am using RetroNET to chat with DJ Sures right now.
I've sent him an archive of the MAME/MESS build for Windows with the settings / ROMs, he'll probably post it on nabu.ca later. I included a nabu.cmd file that will start the emulator with the correct command line settings, just run DJ's Internet Adapter software first, start the TCP server, then run the nabu.cmd file.
Only problem I've noticed is we need to map the keyboard page left / right keys to page up / page down, which it doesn't look to be supported yet. But you can work around it with a joystick.
Here's the URL if you don't want to wait:
http://yacko.howardpoe.net/MAME_NABU.7z