The RT rail has holes going through it - I'm observant huh. Are these constant air or is there a good way to make these send air only on trigger pulls?

I'm asking because I am interested in the turbo-loader as part of a steam punk project. Frankly I am trying to make the thing look as "hosey" and complicated as possible. I will use a 3,000 PSI tank and likely cover all macroline with copper.