I also volunteered to help out with the rendering; first ripping the tiles and palette from MAME and enhancing my Donkey Kong demo to work with Phoenix as well.
|Neo Geo Phoenix demo|
After coming to grips with the nuances of the NGCD vs MVS, such as the sprite format, it was quite straightforward to add my demo rendering to the emulator. I've still got some tweaks and clean-up before I send it back to the original author, but at least it will give him a head-start on the display - something I've had a lot of experience with whilst working with FPGA emulations!
It might also be worth my while getting Donkey Kong running with the C Z80 core, just for fun...