I carry 100' of chain for the 15 kg. "Martian Hand" anchor in the locker, but never put line in it. Chain is needed around coral heads (not a problem most places) and it stores in the locker and drains into the bilge, not overboard. I store line on deck.
I have been thinking of building a couple of deck boxes for the foredeck to store line in, you see them on yachts from the 50's and 60's, and also to provide some seating. Sadly, I have windows and not the nice seat at the forward edge of the cabin.
Has anybody built such boxes? It would be nice to neaten things up forward. I have the Bruce, one of those aluminum sand hooks of about 35 pounds, a 60' folding yachtsman to allay serious paranoia, a small lunch hook, and a couple hundred feet of line. Needless to say, there isn't a lot of extra room.
In Florida and the Bahamas it is common to anchor using two anchors, and the bottom varies from mud to sand to hard marl to coral, while the weather can go from bright sun to 50 knots in 15 minutes, which is why so many hooks. If you don't believe me, ask sorrydog.
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida