Have you considered looking into PDP-6/10 spacewar? We have two versions using the 340 display (which I've even played with friends, sadly not on a real 340 of course) and one for the Knight TV.
Well, it's on the list. But I've to become a bit more competent on these systems first. Next one will be a version for the LINC (for wich I've already retyped and assembled the source code).