Guttering on bush shed

Just finishing a bush shed, with wooden posts as uprights and 3 poles as "rafters", to which top hats and corry are fixed. Shed is 7m, and I guess the conventional approach would be to fix a 7m fascia to the "rafters" (about 130 mm poles), and then brackets and guttering.
Looking for smart ideas to minimise the cost of the fascia, or do without.
Lysaght had/have a product (FitFast - Lysaght: LYSAGHT FITFAST® Gutter) that fixes directly to the corry, but there is no adjustment, so no run off - apparently they don't sell a lot.
Any bright ideas?

Thanks

GF


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