Re: sim profiles and interview....lots of info in last 300 pages here but my advice is "latestpilotjobs.com". They have a paid interview prep with latest info for about 40$
Re: 787 sims.....there are two 777 and two 787 sims in Doha so most of the training is in house....as the 777 fleet is bigger and one sim may be down in future I would expect some of the full type ratings to still be sent out to Sin/ London