To place hammock at indoor, you need strong stand. You can find various designs for this stuff at store. However, you can make your own stand use affordable material. Wood and metal are common material for frame to hang hammock. Wood is more natural and suitable for room decoration, it becomes more just stand for hammock if you construct in creative way. As for metal, this material requires special tools to form into stand, as you want. You can rely on metal workshop to make several adjustments. Another stand is hanging rope. When using material for stand, you can take inspiration from bridge construction.