the gobos, ready to go to the studio
One major mistake is to make the room totally anechoic which would also lead to unatural and bad mixes so four Gobos should be enough. The result is rather impressive. They didn't eliminate the echos totally and the first days they emit some fumes from the adhesives but the recordings now sound a lot deeper and more defined, actually a bit louder although with less usage of compressors.
The impulse recording I use now as a nice and strange effect in a controlled manner.