Timelapse Camera Slider - McKaye Slider MKII

I use this kind of Motor:
http://www.ebay.de/itm/Elektromotor-6-12V-DC-Getriebemotor-Modelbau-Motor-NEU-/360891547532?pt=LH_DefaultDomain_77&hash=item5406cfff8c
it works perfectly, Controlled by a Raspberry Pi

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http://youtu.be/ejCYPgJXKxo
assambling video
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https://youtu.be/RF5hLo9Qab4

80x40 aluminum profile