Beautiful handcrack. Highly recommended for those looking to practice jams in a perfect, relatively low angle splitter crack. Crux is probably the first 15 feet over the block.
Yes, there are chains about 70 feet up; rap off a 60 meter rope, or run to the top of the cliff up some 5.10 moves.
Double ropes are not needed and would provide little benefit over a single line (other than peace of mind).