Excellent work Matty. You and your folks have done well building it to what it is. I have to say that I was initially worried about the height of the adjoining wall and your houses' roofline, but the height of the pier plus GEM give you plenty of clearance over them.
I really have to pull my finga out and start mine. We were going to sell our house for a while there, but i think we'll stay now - so time to build.