Replying to Hydraulic Camcorder Jib (help)

Ive been looking around for hours and I cant seem to find a good way to replicate this jib.
[IMG]homebuiltstabilizers.com/MembersRigs/Jibsncranes/jasonhunspergersjib/main/jhcrane2.jpg[/IMG]
[IMG]homebuiltstabilizers.com/MembersRigs/Jibsncranes/jasonhunspergersjib/main/jhcontrolsside.jpg[/IMG]

I love the fact that its hydraulic. With it being hydraulic it can pan and tilt smoothly from the controls on the bottom of it. The problem I'm having with the design is where to find those kind of hydraulic struts or pistons. Did he just take a regular gas spring hydraulic piston and tap it??

[IMG]homebuiltstabilizers.com/MembersRigs/Jibsncranes/jasonhunspergersjib/main/jhfullhead1.jpg[/IMG]

If anyone has any ideas please share.

Link to the jib
http://www.homebuiltstabilizers.com/MembersRigs/Jibsncranes/jasonhunspergersjib/index1.htm
Link to gas spring hydraulic pistons I found
http://cgi.ebay.com/ebaymotors/Pair-2-ea-gas-spring-gas-springs-struts-shocks-new_W0QQcmdZViewItemQQ_trksidZp3286Q2ec0Q2em14QQhashZitem1e584eeb4aQQitemZ130330585930QQptZMotorsQ5fRVQ5fTrailerQ5fCamperQ5fPartsQ5fAccessories