These instructions are for OPENSTEP 4.2. I haven't used NEXTSTEP 3.3 in the last 10 years.
1. Double-click on "Preferences" (the button with the clock/calendar) and in the "Unix" panel check "UNIX Expert":

2. Most people agree that 2GB is the largest "safe" partition for OPENSTEP;
3. Even the the latest OmniWeb (3.x) will display most sites "incorrectly" :)
4. AFAIK NEXTSTEP/OPENSTEP doesn't support long DOS filenames. I use HFS for all my vintage software CDs (OPENSTEP, Mac OS X Server 1.x, IRIX) . You will need a Mac for that, of course. Having a Mac is really handy, especially one that can run Mac OS X (you can serve files via NFS to your UNIX boxes). G3 Macs are dirt-cheap these days;