Looks pretty easy:
although the nonstandard file system seems weird.
Both the lwip core and the ppp-new branch have been updated since January, so I will try to update them first. Also, I will try to use the MPW compiler flag for using Unix paths. I had no idea this existed when I ported the code in January. Hopefully, this will make my implementation standard enough to include in the lwip contributions branch.
Also, I did some research on how I can test the web server with 128K of memory (rather than the 512K my computer was upgraded to). It looks like I can just solder a jumper to disable one of the RAM address lines, making it 128K.