If you need to work on it for anything, I highly recommend trying to get the MMC5 version going, in large part because it is significantly more advanced than the MMC3 build. Even though admittedly MMC3 might be easier to get running.I have never tried hacked roms when patching but I can test if it works for me.
It just got updated to 1.00, so safe to say it's pretty much release-ready. About the only big thing that the creator of the romhack was waiting for was a proper english translation (he admits his own limitations, that's why the current selection is Japanese and "Engrish" ) but it sounds like that fell through.