Well, installed and booting now. I wiped out the mini's OS X and re-installed a fresh 10.5 on it after making my 3 partitions. Then installed MorphOS. Have not played with it much yet but 1st observation, that it does not save the state of the windows the way I set them up. They open in their original spot and size. Maybe this is an Amiga thing and I have to do something for sizes and movements of windows to stick.
Yuo can enable it from MUI settings. On the desktop from settings menu -> Global MUI settings. I can not remember out of hat (I am at the work now) but IIRC Windows -> Remember window positions on exit. Or something like that. I wish this was enabled by default...
You can also save window positions manually by snapshotting them. There is small dropdown menu in top right window bar. Select snapshot and window position/size is remembered.