Fairford solar details

We’ve got a very early fairford that was supplied without solar, I’m considering fitting a solar panel or perhaps two. Does anyone have a picture of a Fairford roof showing how A/S have positioned the panel on the roof, where the cables enter the roof and the type of gland/glands they have used for the cable entry through the roof skin. I’ve got some ideas but wondered what the manufacturer had done in case I am over complicating it. 

Any tips on routing cables from the roof down welcome as you only get one chance to get it right, and then it’s a bodge.

Thanks