Hmm well that would indeed be pretty cool if we could essentially generate a complete NAND partition in the future, without a working chip. Though what could you actually do with it? I assume it would be like a bloatfree version of windows without drivers, where it loads but that's it. It can't access the consoles ACTUAL NAND because it doesn't exist if it's fried/missing entirely. Or would you somehow be able to use a parsing tool from bootrom that can restore missing titles if they're present on the SD card, to work in tandem with assumed created "half-NAND"? Sorry, I'm just thinking out loud now....Hmm, I didn't consider that. You probably do need a partition table for GM9 to know where to write the ctrnand backup.
Without a NAND chip or at least parts of the original chip, it might be impossible to create a working emunand, I think there are some things like NAND CTR and NAND CID that are required to encrypt/decrypt the NAND, at least if yellows8's crypto tools are to be trusted.
Those should be obtainable even if the NAND chip is failing/faulty though, as long as it's not completely fried.