RepRap X Carriage LM8UU Remix with a 12mm Proximity Sensor Hole

I made some modifications to Jonas Kuehling X Carriage as follows:
Reinforced the screw holes.
Took off the ( what I assumed were fan mounts ) at the ends.
Shaved off 1 mm so a 10mm X 10mm extruder fan will fit.
Created a mount for placing a proximity sensor and a place where you can also mount a substrate cooling fan.