It is a great site Ian. There are a number of hills around; up to 15-20 deg to the NE to ESE, which is not an issue as it blocks the light from Nambour, Maroochydore and the rest of the coast and there is a hill to about 10 deg or so to the S that block most of the glow from BrisVegas. The only real glow is where the Southern and Eastern hills meet in a valley (where crux rises) and even then it's not objectionable. None of these hills are going to worry me excessively as I won't be imaging that low anyway. The only real problem one is the to the NE. It blocks a bit of sky but I can live with it
It will be mains powered.