I need to replace my Series 3 rear safari door. The aluminium panel is badly corroded because the internal steel frame is very badly rusted. To avoid this in the future I thought I would fit a galvanised -frame complete rear door from SP. Does anyone have any experience of these please? I wanted to use Paintman Panels but they only supply standard steel/aluminium units. I understand they are a bit more of a fiddle to prepare for painting as the frame is galvanised.