Hi all, just wanted to say that I had the same experience when I tried to put 5.0 on my iBook G4 last month. I ended up just putting Tiger back on it for a few weeks, and then a couple days ago I re-read the macppc install file. I went with MBR, and made the changes in ofwboot, and was able to properly replace the old Tiger with the new (5.1) Puffy
Was easily able to get on my wifi, and download some packages. Next step for me is to make X look pretty
Unless you *need* to dual boot, I'd suggest strongly just wiping OSX off the mini and running OpenBSD alone.