it took me quite a while of working out getting those beams in the right positions. Quite fiddly that was.

Precisely, I have not managed to count the number of boxes used to achieve this effect. [:)]

I also notice that I might want to change the sky texture as it looks like it might rain soon. [:))]

The original project uses a Big sun sky texture but I found the Very cloudy sky texture gave a nice effect in IBL rendering.