Good news: Power Distribution, the first map, was not on that HDD. It is A-OK on my backup drive, which I am running on now. Ive also backed up all the mod files on this drive to USB sticks to prevent any further catastrophe. So, the Mod has only lost one level - and not permanently. There are two methods of repair, one is a little more technical but a lot cheaper than the other option. I can either A) purchase another HDD with the exact same board on it, or B) send off for an adapter and follow some mildly complicated instructions to un-brick the HDD.
Either way, its just a minor setback. The entire Mod is not lost, and work continues slowly on the first level as it nears completion.
I apologize for not updating the status of this mod sooner; its been a while. Rest assured, it is most certainly not dead not dying.