does that already pete.
opening the bottles allows the liquid into the system, but this forces the valves shut. you then need to turn the master valve (by the link) to on to allow flow to the actuator/pilot valves. switching yet another valve to on now means flow can access the valves in the main system, and the weapon can fire if the servos turn the pilots.

In short, arming involves turning on the bottles, system cannot fire, then turning on the master valve, system cannot fire, then turning on the pilot valve, system cannot fire, then switching on the reciever, which now means there is a method of operating the pilots to fire the weapon. its very safe. I am changing this system now though, so will keep remotely failsafed arming in mind when i build it.

thanks john, ill keep those ideas in mind.