McAlpine's project director, Tony Aikenhead, explains how the tension ring was built on a temporary scaffold and raised into place on cables hung from the compression truss, by 56 computer-controlled jacks over a period of six weeks - the tension forces pre-calculated for every stage of the lift.
The 14 lighting towers, 28m tall and weighing 34 tonnes, were then hauled into place by a super-crane, held with vast temporary stays, belying the fact that they now hang effortlessly from two barely visible 25mm cables.
Once in place, the whole structure was laser-scanned to generate a 2 billion-point digital model - which was miraculously found to be within 30mm tolerance of the original theoretical model - a tribute, as the architect, engineers and project manager keep reiterating as they shower praise on each other, to the unprecedented level of integrated teamwork.
For all the precision engineering involved, there is a refreshingly English attitude at play beneath the slickness, in line with the "make do and mend" spirit of the 1948 Olympics.
At a stage when all of the construction drawings for the steel superstructure had been made, the supplier discovered an alternative cheaper source: a hoard of unused gas pipes, "found in a field in Yorkshire," grins Aikenhead
"The stadium is likely to evolve over time," says Aikenhead