Caravel huh. Lateen rig. Never sailed one, so most of the following is observation from images and deduction.

When moored up it looks like the sail is usually bundled up against the yard (the diagonal spar the sail hangs from). Since the yard looks both too slender to support a human properly and doesn't seem to have ropes for a man to stand on to do so then I imagine the whole yard is lowered, the sail bundled, and then raised again to get it out of the way.
It looks like each yard has sheets at both ends, possibly with pulleys, these would not be unshipped but left and probably tightened and the excess rope belayed away as above.
You would probably only have the rope ladder arrangement on the tallest mast and only if there was a crow's nest up there. There would be no need for regular access up the mast otherwise for the above reasons. Maintenance access would be by temporary rigging of a bosun's chair or just plain climbing the mast.
It looks like there are 3 or 4 stays (the ropes/wires used like tent guy-ropes to hold the mast upright) per mast. These will be more or less permanently tied off and unlikely to have much excess length as they remain static.

S'bout all. Hope it's vaguely useful?