Nothing overly complicated here. This was my original "homemade" solenoid manifold for the Shocker SFT. It's made from stainless steel to help prevent stripping and additionally allow it to operate at a higher pressure (for custom projects).
Due to careful placement of the grooves, I was able to use a 1x2-mm ID o-ring on the bottom of the manifold (instead of a 1x2.5-mm ID o-ring that the stock manifolds use). This was made into the stock manifolds to help guard against manufacturing problems, but I saw around those.