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Hello Martin, I am not aware of a publication that gives the guidance you have requested. However I have fairly wide experience in bridge construction and will help if I can. Maximum applied vertical loading on a pedestrian/cycle bridge generally occurs when people gather on the bridge to observe something of interest. This can amount to 3 - 6kN/m2. Maximum horizontal loading on an edge barrier or parapet generally relates to people all leaning along one side, again to observe something of interest. On a very small span this edge feature can be supported independently of the spanning bridge. For a significant span over a watercourse the effect of floating debris (branches/trees) may dominate. Do you have any typical sizes of available components (e.g. diameter of bamboo poles)? Where many components are fixed together to form a spanning structure the method of joining them may be the determing factor. In the absence of proprietary fixing components a locally sourced tying system may be the most appropriate solution. Local expertise will identify what is available and what is most effective. I hope this is of some assistance. I am happy to respond to further and more specific queries. Regards, Giles Waley