Sheet Metal Contractor. Since 1937, Tuschall Engineering has stayed on top of the evolution of metal wall panels. Our focus on lean project management has enabled us to greatly reduce the probability of unforeseen circumstances; this has proven to be an effective component to maintaining our reputation for fast turn around and quality work. Implementing very tight planning, our project management team focuses on providing essential support by determining the work process from the initiation of planning, through to building approval and execution.