Chris,
When you say, "I've heard that modeling in the flat goes against the design of sheetmetal" are you saying it goes against the IronCAD way of designing sheetmetal or that it goes against general sheetmetal design. I agree, it doesn't seem to fit in the way IronCAD designs sheetmetal well, but if you are talking general sheet metal design, I disagree, the flat design is more important than the actual folded sheet metal part due to the use of standard tooling used to create the flat blanks. I would hope that we could get to the point that you could create in the flat, and select the locations that you want to fold to create your sheetmetal part.