"Because CBM did it" Well ask him, I'm not an expert. I only know a few things. I don't even hack gold anymore so, yeah..
There's something I noticed about you, why do you focus on non important details for the hack rather than the Critical aspects, such as Scripting. You should be focusing on that. A hack can be a hack, without tiles you know, and maybe the titlescreen too. But if you want, you can do that...
P.S. Tiles are a pain in the butt for Gold! You'll see what I mean, once you find the tileset