I am busy designing a 1m cubed box that is made of lego girders, it does not have walls, floor or a roof yet.
I always thought that the X or 'triangle' shape girder pattern was strongest, (like this) -
However in lego you cannot bind the bars of one cross to the centre, each bar would have to be behind one anothe.
The first design I created could support 112 ibs aprox and it was the one at the front in the below image.
Here are the 4 designs , I think the two at the front of the image are the most likely but I only need one type of girder so far.
LDD File here:
Edited by SNIPE, 14 April 2012 - 01:34 PM.
Removed oversized pics