And another reply to myself. Installation was successful (I let it go overnight). I think that anybody using AMIX will be very pleased with this upgrade. Having used it a whole 15 minutes now, these are the additions I have noticed so far.
* bash shell (!!! tab completion woohoo!)
* perl4
* netnews
* sources for x11r5
* sources for gcc2.0 (default compiler still 1.4)
* audio driver present in kernel
I have also noticed that the system is more responsive under load than before, particularly during heavy network I/O. NFS transfers seem to be taking place much faster. Things that took nearly an hour to copy now take minutes.
I have attempted to install the 2a patch disk (brings AMIX up to the latest so-called "2.1c" revision, if I am reading Usenet correctly). This depends on package management to be present. I changed all the checks for packages to true in the patch script, and was able to install the software updates, but kernel compilation failed. I am right now working on restoring the package management system so I can use the disk properly, but I am able to use the updated software just fine.
After using this for such a short time, I can already agree with the statement that 2.03 is buggy as hell in comparison to 2.1. 2.1 is indeed very pleasant so far. Glad that a piece of history won't be lost forever.
*edit* network speed test just finished, I am getting 160KB/sec now via nfs, before it was between 50-60KB/sec.