There is something particular about those pictures: the picture of the overflow box shows the drain lines coming to the same place where the return pump is.

ooops.... The rest of the pictures show the drain lines in the correct position !!!

Those unions surely come in handy !!!
I'm not sure if the blue PVC is standard. Maybe it is. I think it's blue PVC for water lines and white for electricity (that's only my impression !). PVC accesories (elbows, valves, etc) are usually grey, though some manufaturers make them blue (like the pipe).
Massive switch box: LOL I thought it was too much at first, but it keeps all the cables sorted out in a visible place.
The silicone job: not the cleanest, tho I'll remove some excess, except in the glass joints. Better safe than sorry. People have come to visit and doesn't notice it. They keep asking if I plan to keep sharks in there
Thanks for the possitive input, man
I appreciate it!
BTW, How's your new project going on?