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Need internal GIB stopping & potentially Painting - 68m2 house

We just placed a prefab on a site and need to finish off the interior works ourselves. Walls are ready to be gib square stopped, primed and then painted. We're looking for the most cost effective solution so we'd like to get pricing for both: gib stopping only (walls left ready to be just painted by us) AND square-stopping + painting (the whole package). The house is 68m2, 2 bedroom house, approximately 160m2 of walls and 68m2 of ceiling.