TV Typewriter Cover Unit location?

Hey there, I'm currently working on a replica of Don Lancaster's prototype TV Typewriter (pic here: http://s1381.photobucket.com/user/unclefalter/media/20151011_125748_zpssu7yy ujf.jpg.html?o=0 ) and I was wondering - does anyone know where the unit that appeared on the cover (with the more refined keyboard) ended up? I've asked around, including Don and nobody seems to know where it got to. I'm also wondering if anyone knows a source that might have the keytops that unit used or something close (I understand they were made by Mechanical Enterprises). I've enough parts here to build two or three TVTs and I thought after I get the prototype replica done I might go for the cover unit, esp. if it no longer exists anymore. But I understand those keytops were kind of a one off deal for that article. Thanks!! Brad