My systems temperatures are extremely mild, overheating doesn't appear to be an issue, however a motherboard processes a lot of electricity, I just wonder what the situation on the back would be like.
As for the LEDs, I was planning on making my own as when you have most of the components it can be cheaper, provided you know what you are doing. I would insulate it all, so it should be fine. However the insulating part may be somewhat difficult, I am actually pondering drilling LED sized holes in the motherboard tray and just having the tips of the LEDs poking through, I think that is potentially much easier.
As for photos, photos of what exactly?