This shows the results of my most recent research into the Soviet Moon Rocket, the N1.
Specifically, it shows the initial design, that was never built. There are several changes between this and the first flight version:
Fewer engines in the first stage
Smaller fuel line covers
Double rings around both open interstages.
But the biggest difference is that there’s a gap around the first stage hull, intended to allow air to flow through the hull and out the rear. This was intended to reduce drag and improve efficiency.