You are right about the spelling of the Battah family in Joliette, but they had many relatives in the Montreal area also. They did operate clothing stores and I think the Bata shoe stores.
The studio project is advancing, we will be installing drywall and soundproofing later today. It is a long and costly project that will be completed in stages. For now, we won't be soundproofing the ceiling for it is a suspended ceiling and a big obstacle is the way the electricity is done I can't close the ceiling without re-doing much of the previously done wiring.
A few months ago we made a series of triangular bass traps and we will eventually be making sound traps similar to the ones you showed.
The classes are given in my shop and the current semester ends this coming Saturday. I'm not sure when the next class will be for I am having a surgical procedure on the 14th, and I will need some recovery time.
Don't fear your tools, pay attention and respect the tools and avoid injury.