what dd it not install that you need?? try emerge --search kde and see what you get back.. I wouldn't even bother using porthole.
If you want to use Gentoo.. you can convert VidaLinux to complete Gentoo...
emerge gentoo-dev-sources (for compiling your kernel) or emerge genkernel then genkernel all to compile and install it. then you can just change the /boot/grub.conf
next, simply "emerge -e system" and go to bed..that will rebuild the whole base system. When you get up, set your USE flags in /etc/make.conf(if you want to change them, if not, leave it alone) then "emerge --update --deep --newuse world" and let it rebuild your world.. oh.. and also emerge grub and install the gentoo grub so that you don't still have the VLOS grub screen.. I did all this with my notebook, and don't have the slightest bit of anything relating to Vidalinux now...