That was my first projector. The comments about the fixed focal distance and a nylon cord used to set up the distance are correct (the "focus lanyard"). However, there was a "large venue" model with pincushion correction built into the lenses for a flat screen, which was set up for a 10' diagonal 4:3 screen (6x8 feet). This model also had a fixed lens shift such that the top of the walnut "credenza" cabinet was even with the bottom of the screen (or the credenza could be suspended from four chains and heavy eyebolts in the ceiling above the screen). The lenses are liquid filled with glass surface in that model, whereas the cheaper set for the curved screen used molded plastic lenses.
Sorry, but I have no memory of model numbers, although I remember that the model name changed from "NovaBeam" to "VideoBeam" at some point, when Henry Kloss spun off Advent Video Corporation from KLH and patented the "Novabeam" liquid filled tube. The resolution could be set either at 640x350@60Hz (aka EGA) progressive or 640x480@60Hz progressive (in the days before "VGA" was named, using seperate external NTSC tuner and "line doubler" boxes). The monitor itself had a built-in test pattern with a rectangular array of dots. You stretched one vertical black string and one horizontal string, and tweeked 20-odd little screwdriver-adjustable potentiometers for linearity by trying to get the dots exactly on the strings.
It was an awe-inspiring setup in the early 1980's. I had mine attached to a C-Band BUD (Big Ugly Dish) in the glory days before HBO and Cinemax (the two original movie channels) implemented scrambled signals. I'm approaching my 30-year anniversary with that original "Home Theater".
Interestingly, I still have a pair of KLH Model 6 speakers from that original Home Theater, and they still work, they are attached to an old audio setup with a turntable. I believe Henry Kloss founded KLH after selling his original Acoustic Research company, where he invented the "acoustic suspension" closed box design for extending the bass frequency downwards. He founded Advent when he began experiments with video equipment.