Awesome, thanks for the pics. I will then buy a case like yours. I am liking the red you have going which I will do the same as well. These are some great IEMs.
Once you switch to FiiO cable, which btw looks like this (using red faceplate for Right side ;)):
you will realize that UE900 storage box going to be too tight because RC-SE1 connector is bigger, and cable is thicker and more springy.
Get any $5 hard shell round zipper case from amazon or ebay (those 3" in diameter) and it will work great for traveling or everyday use. With a mesh pocket inside, I typically wrap the wire (the usual 3-finger wrap) and stuff the wire and connector inside of the mesh pocket, while W40 headphones are on outside so they are well protected from rubbing against wires or connector. W40 gets VIP treatment ;)