These would probably be the best base for it, but because of various reasons I can't compile the source code provided to build the files my own.
I have already seen the thread with the released GunZ 1.5 source code by Dawson linked after and the thread with the released Gunz 1.5 Database by Emisand linked after. I'm looking or asking for a release of compiled GunZ 1.5 server files and compatible client files, with preferably untouched original (MAIET/IJJI/Aeria Games) content without major custom modifications.