I figure I should document this, just in case someone else contemplates the futility of life while trying to figure out what went wrong.
I have restored a Performa 475. It's great. I am using a ZuluSCSI Slim with WiFi built in. Bit of a hassle to get the DaynaPort drivers working, but eventually, I had success! I was able to log in to a public FTP site and verify that I was on the internet. However, I have installed Netatalk in VirtualBox on my old Mac mini server, but despite tinkering with afp.conf, trying every permutation of setting, and pouring through the Netatalk documentation and ZuluSCSI documentation for a clue, Chooser on System 7.5.5 would hang when trying to access my AppleTalk Share.
I was certain I had misconfigured Netatalk. Or maybe misconfigured 7.5.5.
Until... I updated the ZuluSCSI firmware. Now, it connects flawlessly. So if you are having trouble using ZuluSCSI with the wifi function and AppleTalk is not cooperating, update the firmware. And have fun.