One other component I didn't mention is a basket of wire wool under the breather plate. That is the first effort at damping and condensing
oil fumes. Most of the
oil in the puke tank is cooling and condensing to drain back as a liquid. Theoretically only the excess escapes as vapor. Gearboxes and differentials have a lot of air and a little
oil in them. When that heats up it expands alot and if you tried to contain it that sure tests any seals or gaskets. The comp Cobras used a tube up to a vented master cylinder reservoir in the trunk for the differential. Most cars use a little rattle cap type vent on the diff and trans to allow for expansion and not blow seals.