How to Secure PCBs in a Stratospheric Balloon's Electronics Box?

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Hello

I'm designing a box for 6 PCBs. It will fly on stratospheric balloon. Do you know a solution of mounting PCBs to box walls, which will provide strong and stable connection? I was thinking about slots in internal walls, but that can be not enough.

I found interesting solution:

http://img94.imageshack.us/img94/7586/dsc9131.th.jpg

Do you know something more about that type of mounting? Where can I get these parts, which hold PCBs?
 
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That looks like it was custom machined.
You can get regular diecast boxes with pcb guides from the normal electroncs supplies.

But - if you are concerned about weight and ruggedness more than easy servicing I would probably connect all the boards together in a stack with screw standoffs between them and then put them in a box on some sort of foam/rubber/shock-absorbing mount