Thanks again, Chris, for sharing this design. I have been working on building it and adding some tweaks for my specific application.
One warning red and black 700x500 owners need to know (and others should check) is whether there is enough clearance with this design for the moving head of the laser when the head is operating while located toward the very front of the machine. I just happened to notice this issue when I was watching closely as I closed the lid. I mounted my unit as far forward on the lid as practical so it would be most centered when the door was up (guessing this would make distortion correction easier). The picture below exaggerates the issue due to the angle I had to use with the camera, but the top brass adjustment knob will strike the mount. I think I can fix this by narrowing the excess width of the camera holder’s design.