The second photo shows a Hans Mader all wooden boat from the same period but less advanced, with a half double bottom. This one has a curved traveller track. The controls are set up in a similar way and very simple. I suppose this boat had the spinnaker sack on the port side, which is unusual.
Recent heat and hazardous smoky conditions outside prompted me to go through some old photos. Here are a couple images that may interest you, too.
My brother and I set up a booth for the Austrian FD Class at a big boat show in Vienna, and this is where those photos were taken. The photo of the full double bottom boat is a Leonhard Mader; one of the first models with full double bottom. The cockpit was open all the way to the transom where a narrow beam held up the rudder. What struck me is the simplicity of the controls back then. We already had lowers, but the extreme raking had not been fully developed; we were still sailing with the small spinnaker. Also note how the helmsman’s hiking straps are crossing, probably because the helmsman has long legs.