I have never built a low level deck before, as iv never had issue with ground clearance, iv also only ever built bearer and joist framed decking structures, I am currently about to start framing a deck and my heights are concerning as I an set by existing structures I cannot alter, were you saying earlier I can frame it in 90x45? That would be ideal as I could raise it accordingly to meet my minimum/maximum rise (220mm) for where it will step down to an existing surface.