How did you cut that angled groove—with a mitre box?
No, I neither knew about them nor would I have had access to one big enough. So I asked around and was assured that I would need a circular table saw; then I figured out that I could attach a guide plank on top of the piece of window frame into which I was cutting the groove. The piece of window frame (see the figure) was gradually being pulled sideways while the guide plank kept the entire contraption on track. Then I had to apply the same measurements in mirror fashion to the opposite side. It worked! The rear window is made out of Plexiglas, which has fewer direct reflections than regular glass. Plexiglas had served me well in my previous location where I used my old booth to record a lot of records (with Brenda Russell, Melissa Manchester and others) so I stuck with it. I used silicone filler for the insulation and flexible bolstering of this window to prevent rattles after installation. After I mounted both panes of glass and secured them, I measured extra carefully, cut the openi
