HI, here is my insert for the boardgame Power Grid (hoogspanning in Dutch). This will fit perfectly with 3 expansions (Australie-INdia, benelux and northern europe). This way, you can store the box vertically. If you have only the base version, you'll have to store it horizontally. I place 1 board on top of the components just to be sure.

You'll need 6 players boxes, 2 small resource boxes, 1 large resource box, the 2 trays and 1 spacer to keep the card tray in place (not visible on picture). I use sleeved cards on the base version and  non-sleeved cards of the expansions and both fit. 

Set-up is extremely easy now.