Hi Fenix,
Thanks very much for the advise. I have a reasonable >8,000 sqm plot of mainland and most if not all of my neighbours have skyboxes themselves or huge monstrocities on their land. I may try and build a panorama surface around the outline of the plot to see if it is big enough. After that I can decide whether to do it in the sky or not. I don't have a lot of experience buildin, so will see how it goes.