After reading through some materials, I decided not to go for simple X forward with SSH – instead, I will set up a VNC server so that I can use X on the server as well.
I read through the VNC overview document on Gentoo Wiki, and decided to go for tightvnc; emerging it pulled some X libraries onto the box (naturally). Here’s a howto from the Wiki. Oh, and before the emerge, I add the “server” USE flag to /etc/make.conf.
Then, as normal user, I start vncserver on the server and create a password. On the client, I test with vncviewer – works! Finally, I configure /etc/conf.d/vnc, specifying the display variable.
Now, it seems that vnc is up and running and that I can connect to an X; but I still need a WM. I haven’t decided about it – after messing up a little with enlightenment, I found it too complicated… 
Will have to wait, I want an easy-to-use, lightweight WM… let’s see.
