X carriage PM single piece

Heavily inspired by http://www.thingiverse.com/thing:164367 and always looking to make improvements to my machine, im experimenting with some additions & alterations to WIldseyed original design.
The main thing is id like to create a universal "slot" below the carriage surface into which accessories can be fitted > fan holders/ cooling ducts/ nut traps etc

This is by no means finished but definitely a work in progress.
Im currently working away from my printer so i wont be able to try th