Starting a summer room on concrete base

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I’m planning a corner summer room, with both long sides (adjacent to the fence panels) being 2.6m long. Currently have a solid concrete base poured that’s level.

One colleague has said construct the walls first, place them on a thick dpm directly on the concrete base, then once fixed together, build the floor inside the walls, also resting on the dpm.

another has said to build the floor shape and joist/noggin it first, on the dpm on the concrete. Then insulate (celotex/kingspan) and fix the flooring boards, then fix the walls on top of the completed base.

whats the correct way please? And how do I get the required airflow under, if the dpm and wood are directly on the poured concrete base?

Thanks gents in advance
 
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