Floating Blueboard Outdoor Feature Wall

Folks...
I would like to say I have taken away so much from this forum and I feel I should share with you how I have used some of your info to realise what I've had in mind for so long as it awaited approval by "the wife". ...Thanks wifey for your trust.It should be noted that I am just a bloke down the street with NO background in construction whatsoever.Now back to the floating feature wall.I had to screen our alfresco from direct view of our neighbour and the screen/feature wall had to be at least 3mx 2.4 high.
Firstly,I sunk 3 100x100 cypress pine posts 600 deep set them at about 900 apart and from ground up these stood approx 2.5m(reason for this will be explained later).After posts had set,I set out to create the FLOATING frame.I used three 190x45 F7 H3 TP which I cut to x3 1.8m lengths and measured at least 300-350 from the ground such butted them hard to the outer sides of the upright cypress posts and one in the middle.The 190s were flush with the 100 cypress at the back meaning there was a protrusion of at least 90 at the front and it IS from this "protrusion" that I created THE FLOATING FRAME.I ran 90x45 H3 TP across the top and bottom and there I had my rectagular frame suspended 30-35cm from the ground hard butted against uprights-spanning 2.4m wide.In this 2.4 m wide span I used two 1.2m wide blueboards and nailed them to the frame.Note that my frame had noggins for extra support.In the end the floating bit was 2.4 wide and 1.8high
See pics below for now
Updates to follow
The middle bit/FLOAT/rectangle bit has been primed and ready for render-Will be using Rockote Render
The cut out is for tiles Rationale:Tiles attached to a blueboard tend to be heavy and Harditex is not suitable to tile on according to James Hardie the manufactureres of blueboard hence my tiles will SIT on a the opening which has been reinforced and my tiles are at least 3-4 cm deep so they should be stacked ontop of each other and glued onto a supporting sheet at the back..pics to follow