Robot Micro Servo Arm

This is a Robot Micro Servo Arm that I want to use to learn about servo motors. Probably I'll be making the hole robot and this could be the left arm of that robot.

I used 3 TowerPro SG90 servo purchase on dx.com (the third I thing I'll be using a grip or something.

This are the specifications:

- Operating speed (4.8V no load): 0.12sec/60 degrees
- Stall torque (4.8V): 2kg/cm
- Temperature range: -30 to +60'C
- Dead band width: 4 usec
- Operating voltage: 3.5-8.4 volts

Last picture is Version 0.1 I make a hole so I can pass the cable through and put the all together.

Suggestions and comments are highly appreciated.

UPDATE December 17, 2013 21:17
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I just uploaded a file that you can print out to have the Arduino Board next to one servo in order get stability. Also I put on the same file some washers that are useful to keep the rotating part of the servo in place.

Also uploaded some pictures.

UPDATE December 18, 2013 19:44
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Uploaded the file