The base plate is made out of 5mm rolled steel sheet.
The steel tubing welded on to the top plate is 51mm in diameter. The top plate is re-used from the original chair.
The original backrest was used as a mould to make two more back rests. It was made by gluing and clamping 1.5mm bending veneer ply.
The seat used is the one from the original chair.
