Superdome to keep construction workers warm in the Fort Hills oil sands?

The Globe and Mail reports that Petro Canada is considering erecting a giant inflatable dome over its Fort Hills oil sands projects in order to enable construction work to continue during the cold winter months.
The proposed “superdome” would measure 200 x 200 metres and be 50 metres high. A Petro Canada spokesperson was quoted as saying that to his knowledge such a superdome over a construction site would be a first. Petro Canada is assessing whether such a structure would be cost effective since it would enable more key components of the plant to be built on site instead of being prefabricated and transported in from elsewhere.
The Fort Hills Project is expected to cost $14 billion and its first phase is slated to be running by 2012.