CADR Lisp Machine System Software 100 Released
tumbleweed.nu
tumbleweed.nu
That's is easy to compile and run.
you can also get yourself a real window manager, like fvwm has FvwmScroll module, that lets you wrap any oversized x window in a container with scrollbars.
you can patch tv.c on usim side to make window scroll up and down for you as you pan mouse around.
the possibilities are endless.