Removing Roof

Fig 1: Roof Component Location

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Mill off spotwelds.
1. 1.1. Using a spotweld cutter, mill off spotwelds in areas A, B, C, D .
  
  Fig 2: Cutting Spotwelds
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Loosening bonded joint
1. 2.1. Heat up the bonded joint between the roof and the cowl panel frame or the rear roof frame with the hot-air gun. Insert a metal spatula between the bonded joint and separate it. Lift the roof upwards out of the body.
  
  Fig 3: Loosening Bonded Joint
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.