I work for an architectural sheet metal manufacturing company and we are moving into 3-D. We currently use AutoCADLT 2008. I have been looking at Inventor, Solid Edge, and Solid Works. What I would like to be able to do is bring a 3-D model of a building from Revit that was drawn by the architect into Inventor and change the exterior with our panel system on it. For instance be able to take a "house" that was drawn in Revit with lets say, lap siding,... strip that off down to the sheathing in Inventor, and replace it with our wall panel system so that I wouldn't have to model the building geometry from scratch. Has anyone done anything like this with Inventor or know of a program that does do this? The purpose of doing this is to draw our panels in 3-D on the building, then break the system down into all of its components to create cut sheets of our aluminum extrusions and be able to unfold the "sheet metal" panel into a flat pattern. Also, what are any opinions on all three of the programs I have been looking at.