Hi gaz2020, Your plan looks too complex. I'm assuming your decking planks will run left to right. Get rid of the green ones and replace them with one of the purple ones taken off the uprights. The relocated purple ones can be supported by joists running between the upright posts. Unless you particularly need buried posts I would suggest you partly bury a 100mm concrete block laid flat under each post. This avoids a lot of digging and rotten timber in the longer term. Regards S.
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