I am a bit reluctant to comment on your design, if you had read any of the build logs you should be aware that Rolled H section is a bad choice. Did you read AVOR ?
better option is to fabricate a beam from 50x50. or get your hand in your pocket and buy some heavy duty ally profile. Dean uses this on some of his big builds,steel is cheaper.
Draw your creation in CAD and you might get better feedback.
Good Luck