Have you had a chance to review the videos on How to Make a Grizz bridge? They are sticky'd so they appear at the top of each forum. There are 4 parts to the series.
There are also many threads in the DIY section that details the engineering of bridge hammocks. Using your trekking poles as spreader bars is perfectly doable and there are videos that show how that has been done to.
Good judgment comes from experience, and often experience comes from bad judgment. - Unknown
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