Thanks for the reply.
I’ve got fabric on the underside of the sat cushions to avoid ballooning. I’m hoping the others can be OK without, but if not they said they can add perfs after the cushions are made. They have cutting dies to do so.
Full perf is not an option as need to be done on a rolling perf machine which is expensive, no-one has, and otherwise would require me to get separate skins with perf/no-perf from the supplier in Italy.
R