Mandrake22: Process bends can be inserted and a flat pattern view is generated in the model, and can be inserted into a drawing but displays as another top view, I could find no way to display it as a flat. Let us know if and what you do to make this work.
Stoker: Mirror solid body does work on sheet metal, but you must pick an edge surface as the mirror plane. Principal planes and bend surfaces can not be used, this makes mating much more complicated as the two parts can not share origin/plane information. Additionally merge bodies is required for sheet metal, so an additional cut/extrude is needed to separate the twins. It gets worse, only one flat is created for this file, the second must be manually created with configurations, derived configurations surpress/unsurpress etc. At the end of the day you have a handed sheet metal part fully associative to it's opposite hand brethren with flat patterns available for both. However no model items/dimensions, cosmetic threads or hole callouts for the mirrored part (separate bug).
Conclusion: Mirrored parts don't work yet for sheet metal, better luck next release! Our engineers could do this faster as two totally independent part files keeping up with the associative link on post-it notes.