Look out for six torches spread throughout each of the mansion levels. Use your firefighter disguise to extinguish the flames and earn a piece.
There are also three unique boulders (with colored studs on them) spread through the mansion exterior. Break them for another piece.
Don the farmer disguise and look for three plant boxes throughout the mansion exterior. Water the boxes for a shield piece.
The final shield piece is actual inside the mansion. Destroy the bookcases to reveal three red and white targets. Shoot these with your astronaut raygun.