The sheet metal tool is amazing and In addition to sheet metal applications I use it for designing and rendering book covers. .
When I put a decal (graphic) on one side of a sheet metal body it shows through to the back side. Although the software allows me to put a separate (different) decal on the back side of the sheet metal body there is images showing through from both directions.
Projecting a separate work area is a possible solutions but that interferes wit the ability to fold and unfold the sheet metal,