So, I was playing with Fathom's new Slax Remix with Zen kernel 2.6.33
and decided to try a manual install to hdd and see if it would boot.
new slax remix is here
Wow, was I surprised when after doing the install I ended up with
a beautiful and fully functional KDE desktop all in 860MB of space!!
Although many things will break if upgrading, etc
I was impressed that with KDE running it was only using about 140MB ram!
And, fluxbox is included too as well as pkgtool, and xwmconfig.
The complete How-To I did is in the slax remix thread at above link,
and also here
After installing to hdd, usb-hdd, etc
grab slackpkg and the gnupg stuff
and install any other pkgs
Be careful about upgrading...
I added kdeadmin pkg from slax module and some other stuff so my install is at 944MB now
and look at output of "free" in screenshot