One of the guys on the Catalina Forum was asking how to lead lines aft from the mast to the cockpit, and this pic barely, sorta shows it.
Of course it also shows the teak rails before refinishing. This is from the ROMP sailing night last summer. If you look closely you can see a block attached to the base of the mast. The line goes from the block to a deck organizer that you can just see the edge of at the left of the photo. From there it runs back to a clutch just forward of the cockpit.