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Hi WinChild, thanks for your encouragements. You have to wire all your components (http://reprap.org/wiki/RAMPS_1.4#Wiring) and pull the cables through the hole at the back of the case. That's what I did.
Note that the 12v power supply is made with an external power supply that plugs into the 2.1 x 5.5 female connector also positioned at the back of the case.
If you print the box, thank's to post a photo of your realization.