Hi, I am repairing a shed and also replacing my old double glazed (aluminium) patio doors. I was wondering if it is feasible to break up one of the old d.g. Units into separate sheets and cut one up to make shed windows. I am a novice glass-cutter and have only cut 'ordinary' glass in the past so do not know if any special tools would be required for the glass used in the patio doors. All I know about them is that they are pretty old. MAny thanks.