We did a final round of testing with a clearer vinyl film by 3m. I think there was a general concensus that it was the best looking on the glass and the least intrusive in the space from the inside and outside. The projection showed some hotspots during the day and the colors were not perfect though. Over all though it the projection showed up good enough to be very impressive. Especially with bold black and white graphics. In the end I think everyone seemed to accept that the little loss in image quality was more than compensated for by the more subtle appreance of the film on the glass.
Now to install the film we hired some experts (i don’t know what company sorry). They came in and had to build these wooden platforms between the two window walls so they could reach the frosted area. It seemed slow going, they had to stop a few times to set up fans and cool down the window cavity. I guess they didn’t want the glass to crack from the temperature difference. Here are some picts of the scaffolding inside the windows.