I've planned to take some high-res pictures of my board this week-end.
Yes, last paragraph of the "Prodigy RAM modules" section.
Note that PALs and gate-array are OTP (one-time programming) so if it's mandatory to upgrade them we'll need new-old stock or replacement, and of course the actual logic implemented.
First step is to provide at least the ability for everyone to upgrade to 4MB. Then develop some open source alternative tools for the prodigy more System 7 friendly, and even some customization tools.