Here are a bunch of photographs that Frederik Petersen sent me that he took of a small exhibition about three years ago in the CAST building, so all the hanging plaster beams above the instrument and its drawings are by Mark West. In the picture above Instrument Three is in the foreground and the beginning of the subsequent instrument is behind it (see a few posts back).
Above: In the foreground are some of the moulds to cast the wax from which the aluminium components were cast using a lost wax (or investment casting) process.