There are currently seven hidey-holes available to build, which cover all grapple spots except for the ones at the south Dorgesh-Kaan and at the Poison waste. When you build a Hidey-hole, the materials required to create it will be permanently stored inside of it. A saw and a hammer are required along with the listed materials in order to build one. A sacred clay hammer can be used, and will grant double experience. A crystal saw may be used, but will not grant a +3 bonus as usual, and a charge will be lost as with regular construction. Remember, the items must be in your inventory. If you have the grapple equipped, for example, you will not be able to build the hidey-hole.