I am making one as well, waiting on couplings. I am using a $5 chinese arduino and a $3 power unit.
http://www.aliexpress.com/item/1PCS-...021670021.html
http://www.aliexpress.com/item/FREE-...589798672.html
http://www.aliexpress.com/item/10-PC...378602118.html
http://www.aliexpress.com/item/2pcs-...539442438.html
http://www.aliexpress.com/item/1pcs-...580354773.html
http://www.aliexpress.com/item/New-H...945043436.html
if anyone is interested in more pics look up "arduino nz" on facebook
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