Hey.
I hate to be the barer of bad news, but I did a quick search on bebits.com (THE repository for BeOS software) and it apears that Be dropped support for PPC processors almost entirely quite early on in BeOS's lifetime. The only version to still support it is the version 5 Pro (version is the latest version Be officially did however), which you'll have to download illegally or find somewhere to buy it :-/
And even then it apparently won't work on G3, G4 or G5, processors, only older PPC processors are supported.
I got this from the following comments thread;
hereLook down near the bottom of the page.
So it looks like a dead-end route. Sorry. That is, unless you fancy trying to port it to more recent processors :lol:
EDIT: openBeOS is a GPL re-implementation of BeOS r5. It's currently unusable on it's own owing to the lack of an underlying GUI.
However, in the future that shuld run on PPC. I believe they are trying to have it work on PPC if I remember right...
