'We faced several engineering challenges while designing a structure of this size. Our major concern was to minimize the deflection, or the sagging of the roof - a phenomenon that occurs when pillars are distant from each other,' Sogani said.

An innovative idea struck Sogani. By increasing the thickness of a very insignificant slab from 115 mm to 200 mm, the deflection was brought within permissible limits. 'This was a magical moment in my 26-year long structural engineering career,' Sogani said.

Further, Sogani went to Britain to get trained in the world's latest technology in building construction - post-tensioning.

Both the post-tensioning technology and the increase in slab thickness contributed to creating this structural marvel.

'We used equipment and technology deployed for making flyovers and bridges to construct this hall,' he added.

'The location of the hall was another challenge. The construction of the roof required 90 trucks to enter the busy site during a period of 36 hours,' Sogani said.

This busy tourist destination also attracts roughly 2,000 devotees that visit the temple every day, apart from the city crowds.

'Help came from everywhere,' Sogani said.

The Jaipur traffic police offered to control the traffic for smooth movement of trucks. RSRDC personnel and temple workers helped with the logistics during the period of roof casting.

Giving details, Sogani said the prayer hall's roof area is about 16,000 square feet and a total of two million (20 lakh) litres of concrete was used to build this hall.

The hall has been constructed using three lakh kg of steel. This quantity of steel could have built 60 residential flats.