Parahawk:
Emirates has BMI requirement
I dont remember hearing about BMI at Qatar....and i have witnessed some that are surely pushing the limit if there is one.
I dont know if it lets you re-apply....I think it might if you use a different email.
It is defnitely worth a try, especially if you have waited about 6 months.
I applied and never had any response so later I applied through an agency(no longer doing screening for Qatar) and got an invite pretty soon afterwards.