I have a plan. It all depends on this question.

Is it possible to run OS9 and OS9 applications on a brand new iMac?

Here's the way I'm thinking. Get rid of the old G4s, get two more brand new iMacs (we already have two so I know how they work), partition new iMac disks and run OS9+apps from there*. No interference with new iMacs otherwise.

Then, ta daa, all four (iMacs) will network / see each other / file-share. Sounds good to me. Have I said enough?

If something sounds too good to be true, it probably is. confused

*I have the original installation disks for the apps in question and can get an OS9 from Apple downloads, apparently. Just the user-files to copy over but I can cope with that.