Each beam has 2 cut-outs on one side and 1 on the other. Face the side with 1 UP.
Took me a few tries to figure out how to put it together. If you insert the crossmembers, you can lift them to insert the next set of beams.
Yes you can put more than 2 sets together but remember the angle of gravity will change with size. You might have to tie the ends.
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