Enablers don't go in the System file itself, just the plain System Folder.
This is what I suggest: Install 7.5.3 first. If you don't have an LC-PDS Ethernet card, you should get one. They are not that expensive and are way, way better than LocalTalk (20KB/sec max, -ish), RS232 terminal (at 115200bps, it's about 11KB/sec), AFP bridges (only work over AFP over AppleTalk).
Then when the CC can support itself, then you can try another method: Install 7.1 from however you'd like to do it, I'd do it via disk images copied over the network because floppies are dead slow (8-9KB/sec write, typical), then try get ahold of every single enabler you can find, and use System Picker to select the boot volume. Although partitioning the drive so that each OS gets its own partition, System Picker makes that concept pointless and in fact works perfectly fine. Then make take a 7.5.3 or 8.1 Disk Tools disk and delete the other stuff on it, and put System Picker on it: make sure the disk works beforehand, and if it does, make a NDIF backup of it just in case the floppy gets weaklegged, as it's the "saving grace" for a System that doesn't have a blessed System Folder. Finally, start removing the enablers one by one until "The One" is isolated. :cc:
This is what I suggest: Install 7.5.3 first. If you don't have an LC-PDS Ethernet card, you should get one. They are not that expensive and are way, way better than LocalTalk (20KB/sec max, -ish), RS232 terminal (at 115200bps, it's about 11KB/sec), AFP bridges (only work over AFP over AppleTalk).
Then when the CC can support itself, then you can try another method: Install 7.1 from however you'd like to do it, I'd do it via disk images copied over the network because floppies are dead slow (8-9KB/sec write, typical), then try get ahold of every single enabler you can find, and use System Picker to select the boot volume. Although partitioning the drive so that each OS gets its own partition, System Picker makes that concept pointless and in fact works perfectly fine. Then make take a 7.5.3 or 8.1 Disk Tools disk and delete the other stuff on it, and put System Picker on it: make sure the disk works beforehand, and if it does, make a NDIF backup of it just in case the floppy gets weaklegged, as it's the "saving grace" for a System that doesn't have a blessed System Folder. Finally, start removing the enablers one by one until "The One" is isolated. :cc: