Is that window a "w" design? The glass in mine was set at an angle forming a W. For now I painted it out as people don't seem to like having a picture window between the bedroom and front room....
No "W", I though about angling the panes but instead simplified. It's just two panes that are 1/2" thick each. For acoustic reasons I probably should have made on pane a different thickness, but oh well ... It works great! Due in part to the fact that each pane is attached to it's own wall, and each wall is on its own foundation. The only thing connecting the walls is the rubber gasket you see in the last picture, so vibrations from the drums don't make it through. That window took me more that 40 hours to build, I had to work like it was a "clean room" so I didn't trap any dust or leave hand prints on the inside of the panes.
If I had to do it again today there would probably be no window, just a big LED Flat screen up on the wall and a few cameras in the performance room. Back when I was building the studio it was a 10 years ago and flat panel screens were cost prohibitive so I took the cheapest way out.
Anyway, what I ended up with works VERY well. You can drum at full volume at 2 AM and nobody hears anything in my house or outside my house. Mission accomplished! :-)