After reviewing dozens of sources, these are the most reliable:
First, a critical distinction found in most plans: A true "Monkey Rocker" is not a traditional curved-rocker chair. Because the user sits very low to the ground (often 6-10 inches high) with legs extended forward, a traditional crescent-shaped rocker is dangerous; it would tip over backwards easily. Effective plans utilize a or a parallel-arm swing mechanism—essentially, a glider. monkey rocker plans