I've got the floppy drive issues sorted out. The dust door was putting too much friction on the floppy, preventing the ejection spring from returning the disk carrier to the out position.
Still, floppies are a terrible way to transfer files. I want to get to beyond system 7.5, where enablers are no longer used and, in theory, I should get an OS which recognizes there's an FPU (assuming I don't have a fake 68040).
I've got an AAUI 10baseT transceiver, so I can get it on the network. Problem now became what can share an AFS volume that system 7.1.1 can read. Failing that, I turned to the PCMCIA slot in the powerbook. I happened to have a 1 GB IBM Microdrive CF card, plus a PCMCIA adapter, as well as a USB reader for the CF cards. However, none of my OSX machines seem to read an HFS filesystem, nor will system 7 read an HFS+ filesystem.
I ended up putting the 7.5.3 self-extracting floppy images on my web server, and then downloaded them to the microdrive. From there, there was plenty of space to un-stuff them and then run the first image to recombine the others into a 7.5.3 install.
So, next stop is to see if at 7.5.3 I can now see my AFS share running on my 10.5.6 eMac. If not, I'll have to find some way to run stuffit or zip the whole 8.0 install CD contents, put it on my webserver, then download it back to the powerbook.