Thread: Advice on glass doors for wall unit

Folks,
The "Big Project" progresses, albeit slowly, and I've reached the point of a trial fit of the top to the bottom as in the attached shot. My plan is to fit 4 glass panelled doors to the top section. The post and rails for the doors will be constructed using the CMT panel set, as were the bottom doors, and the glass panel is intended to have a bevel of around the 2.5cm inside the frame.
Based on the fact that the glass dimemsions are 1040mm x 350mm x 6mm and I am concerned about its weight (I don't have any figures, but if the coffee table top is any indication they'll be bloody heavy!!) I have the following questions questions:

1. Do you think that the joints created by the post and rail construction will have adequate strength?
2. The local shops reckon float glass is adequate but should I use the toughened variety?
3. Will three 50mm non-mortice style hinges provide adequate support?
4. How much play should I leave between the bottom of the rebate in the post and rails and the edge of the glass panel?- I was figuring on 1mm or less, just as long as the glass wasn't under pressure but didn't rattle about.

Thanks in advance
Ian