I can't say I build them myself. If I could, I would. You'll probably have some experts in the Grove itself who can assist somehow.
[As for the locations:]
They do, yes. Callan's lake is well-guarded and difficult for anybody to get to, bar Mizuki, though I'm not worried about him switching sides or getting corrupted since he ate a moon shard. The ship and the cave are also hard to reach, but the difference is the ship is a site of strong residual emotions — love and hope and all of that, which can passively strengthen the wards. The cave is protected by nature itself, and trust me when I say you'd rather not be on the wrong side of the angry fruit sharks or the Cosmic Serpent. The lighthouse is guarded by someone very powerful, and not only full of strong emotions, but the man within is powerful and has guarded it for eons. Just cure him of his Corruption first, like I said.
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[As for the locations:]
They do, yes. Callan's lake is well-guarded and difficult for anybody to get to, bar Mizuki, though I'm not worried about him switching sides or getting corrupted since he ate a moon shard. The ship and the cave are also hard to reach, but the difference is the ship is a site of strong residual emotions — love and hope and all of that, which can passively strengthen the wards. The cave is protected by nature itself, and trust me when I say you'd rather not be on the wrong side of the angry fruit sharks or the Cosmic Serpent. The lighthouse is guarded by someone very powerful, and not only full of strong emotions, but the man within is powerful and has guarded it for eons. Just cure him of his Corruption first, like I said.