Is your ROM byteswapped or not? I think the Zelda community does their patches against byteswapped ROMs for some daft reason.
An unbyteswapped ROM will read b'80371240' in the first word of data, and the filename will be readable. A 16bit byteswapped one will read b'37804012'. I think you'll want to apply it versus that one.
At the very least, there's only two versions of the debug ROM to choose from versus. You want the one with the room fix already applied.
Also, depending on the emulator you may also need to copy the settings for the original OoT and create an entry for the new ROM. Some are very fussy about this (Mupen, for instance), and I know PJ64 has a crash bug in the inventory screens of MM and OoT that require some cheats to get around.
Still, the textures should come up properly unless they were corrupted by, for instance, muddled data.