Mick, Ive personally not heard of a project with the conditions that you mention. The rail works have not started yet, though it will be huge once underway. Stadiums are a long way down the road but lusail city should start cranking up in the near future. The thing about Qatar mick is there is relatively nothing outside of Doha. There are a couple of stadiums planned in the north of the country and an aerospace city in the same area which is roughly an hour and a half from Doha. The main game up there is petrochemical based around the massive ras Laffan terminal but all westerners I know that work up there commute from Doha.
To be perfectly honest I'd be very surprised if any of the projects will utilise western tradesmen, they're just to expensive. Trades are usually from India, some Thai and various African countries with supervision generally being phillipine or Arab. To put it into perspective an Indian spark on the biggest job in the country will pull between 600 and 1000 riyal a month (100 to 180 quid!!!)