Quote Originally Posted by Hard Time
OK, Few questions
1 What would I need to make one of these?
Acces to a lathe or a mill, and the knowledge to use those machines.

2 Who would be able to make me one of these.?
Several roboteers have done so in the past.

3 How would I design it? CAD?
I use a sheet of paper.

3 What kind of valve would I need to operate the cylinde?(it would need to be able to take 700psi and run on 12vDC)
A Burkert 5404 is the most used valve, but I never had a 12V solenoid. Also, it will need to take 1000psi, that is the rule. A Burkert 5404 is know to be able to withstand way over 1000 psi, but can't switch it,. That's the reason why most use that, it's accepted as safe. Other valves used are custom setups with ball valves and actuators.
4 Would I need an air compressor to test it?
No, any source of compressed inert gas with a regulator is fine.
5 How much(roughly) would this process cost?
Depends on your wishlist.