Have been thinking about the manifold for the air solenoids and think I have a solution, at least so far it is looking like it will work.
I plan to make a totally new manifold up but I will keep the original one in place as it holds the PCB's that connect the coils to the wiring. I will rotate the coils on the solenoids and also place the solenoids upside down (actually right way up as they are upside down now) and that way I will be able to plug the new manifold in directly to the old one to use the electrical side of things, the air will be removed to the new manifold.
I have the 12 tool solenoids routing done in the manifold but I still have 4 valves to do for cage up/down, drawbar and air blast and then also I will have to fit the pilot operated valves which work the up/down and drawbar but I will likely add them remotely instead of on this main block. Each of the solenoids has 5 ports so in total (not including the pilots) there are 80 ports that need routed in the manifold.
There is no big rush to get this done at the moment as the air leak is not too bad but better to be ready just in case the worst happens

At the moment I have rigged up an air pressure switch so that it opens and closes a solenoid to keep the pressure between 60 and 80 PSI. This saves me having to have the air constantly on from the compressor and also assures that the pressure is never allowed to drop too far. I also have another switch fitted which is set to operate at 40 PSI, this will be fed back to Mach and, if it is seen, an E-Stop will be called and I will get a message telling me the air pressure has been lost.
Anyway a few pics of what I have so far for the manifold.
Hood