Ask your ATC guy this.
If most men way over 10 stone wouldn't it be going against the laws of equal opportunity if a man of the same weight got the job simply because he was a man and this was acceptable?
I'm not too sure on the answer myself, however, I do know tha airlines probably wouldn't give a crap, as long as you can fit in a seat and don't smell I think you'll be ok. Leave the looking pretty to the rear end cabin crew.