How to say I told you so in a nice way

We purchased a media tower to house all our DVD players, cable box, Apple TV and so on. This was back in August. Justin was supposed to configure all the wires and set this all up before the baby arrived but this never happened. When we were shopping for this piece in August I stated to Justin that the shelves were not deep enough for all the boxes we had. He used his arm as a measuring tape and assured me everything would fit perfectly. Fast forward to January and he finally set everything up. Notice how something sticks way out. I told you so.