For me the bigger the obby is, the easier it is to break the egg. If the egg was so obbied, it would be huge. When players are at the villager shop, I can hop down, break two pieces of obsidian, put sandstone to block the hole, and continue to mine the egg. The moment you can get through one layer, you can pretty much go through the entire layer with no ease. So I just recommend a 3x3x3 square cube..