Need thoughts

i’m trying to hide all the wires on my Di2 setup. i’ve managed to get most internal. now i am trying to figure out the ‘best’ option on where to stuff the excess and that little “brain” part. i’m thinking something like this

http://cdn.mos.bikeradar.com/images/news/2011/07/22/1311332020497-13256vxhaqtv9-800-75.jpg

could i get away with this on the Stock Carbon Shiv part? that area doesn’t seem to have a real ‘structrual importance’ since the screws that hold it together are in front of that area. thoughts? (i know that’s not a carbon Shiv part, but the picture is the idea)

p.s. where is the rear brake? it’s supposed to go into the 3rd hole furthest to the left.