Roy,
Thanks for the offer, but bamboo is available from gardencenters everywhere in the western world, so it is not hard to get hold of. The beauty of this trailer is that all you need is some sticks, rods, tubes or alike. 4 as long as you need the trailer to be, to as long as you need the trailer to be wide, one to connect the structure to the bike (or you push or pull it by hand,) and the last one is somewhere in the middle, just up in the air it seems and gives the structure it strength. Oh, yes, you need 2 wheels too and their axles and a way to fix them onto the trailer.
In the pictures they used green/fresh sticks, and wheels like bicycle wheels.
But the aim of this publication is giving the poor people in poor countries a way to transport a lot for little money and without having to use machinery or having to buy expencive parts. (Every blacksmith in countries like that which is worth the name will be able to make the fixtures for the wheels.)
Willeke