Ok as far as the X11 install, put in your Main Gray Install DVD that came with your iBook. When it opens a window, Scroll down untill you fine the Optional Installs package. Click it and when it comes up, agree to everything and tell it the drive to install to then it will give you a selection menu, click and expand applications and just check X11. That should install. If not let me know. Open Office is still downloading and I will try it as soon as it's done.
EDIT, Ok got the Open Office 2.0 DMG. Mounted it, dragged the program to applications, clicked it, it came up, brought up X11 then loaded and ran. You need that version of X11 in the Optional Installs file. If you follow all the steps I outlined and it STILL will not let you install this X11, let me know and I will figure out how to zap whatever X11 you have on your system. Please let me know what happens.