To answer your first question: Yes, take a look at this article on the Sabayon Linux Wiki site. http://wiki.sabayonlinux.org/index.php? ... nux_system
If you want a fast system, try using the Xfce edition of Sabayon. You can install Calligra on there without needing too many kde dependencies.
Or...you can follow the instructions in the above article on how to install Sabayon "the chroot way," and when the time comes for you to install a desktop environment, you could install Razor-Qt. Calligra wouldn't have any problems running on there. Razor-Qt is basically a lightweight version of KDE, without all the configuration options, widgets, plasmoids, etc, so it should run quite well on your computers.
Every time I compile Gentoo I feel like I should sacrifice a goat.
<3 Gentoo, Sabayon, & Arch Linux