The next best thing (but without Steve Russell himself, sorry) can be found here: http://www.masswerk.at/spacewar (a JS-emulation of a PDP-1 running various versions of Spacewar! – the version closest to the program described in the article is "Spacewar 2B", but the version seen in the photos is probably a bit later and more advanced.)

But of course we ought to visit the CHM, in case we would have a chance to do so.