one thing you are n't taking into consideration!
You have to be very careful with remote set ups , if you use Co2.
The reason is simple , on a gun mounted system , you use a anti-syphon and/or expansion chamber to stop liquid Co2. It works because the gun should always be the right way up.
BUT..With a remote system , you have a strong likley hood of drawing liquid up the hose and into the gun.
If you have an anti syphon tube in the bottle for when its stood up , if you lie down in the game , it works as a syphon tube instead , filling the hoses with liquid. Likewise if its anti syphon when lieing down , when you stand up , it'll draw liquid out of the bottle.
In either case , if you're in the wrong position for long enough , you'll eng up with a gun full of liquid Co2. Not a good thing
( unless you have a gun that prefers liquid C02 , and is set up to run like that! )
So be careful. Know what your gun likes , and make sure thats what it gets. For instance liquid in a mag is not a good thing , it'll send the velocity through the roof ( In any gun set up for vapour Co2 ) , and then the gun will just cough and splutter until you get the liquid out.
New Subject....
Someone asked about twin Co2 remotes too. Way back when , I used to run a VM68 ( A.K.A : PMI 3 , PMI Magnum , and several other name variants ). This is a big gun that has a healthy appetite for LIQUID Co2. So I used to run it with a 3 1/2oz at the front ( under barrel bottle mount ) running to a 12oz out the stock , connected to a 20oz on my back. Next to another 20oz bottle. With a few well placed on/off valves , and some good quick release connectors , anything is possible. Although thanks to a friend , I did once have 40oz of Co2 vent up my back!!! Very cooling!!