Custom parts for Ultimaker 2 Aluminum Extrusion 3D printer

I have done some modifications to make it the way I want it. Actually the only things that are left from the "original" thing is the x/y bearing blocks, motor mounts for x/y and the lengths of the aluminium bars. I would avoid buying any prefabricated plastic parts, so I designed my own x/y carts and hot-end mount. I am driving the steppers at 24V and have a seperate 12V PSU for heating (bed and hot-end) and powering the Arduino. The end-stops are reed swtches encapsuled in custom made brackets