I like to build stone triangle foundations around each other until it makes a circle. Then I stack 2 stone doorframes around the entire foundation. Then put a stone ramp on the top of where you want the front to be and continue adding traps till they reach the ground. The ramps may say that it needs foundation support so put some normal foundations under the ramp and get it to touch the first one. Then just Aggro the therizino and make it run up the trap. When it’s in the trap it might try to attack the trap so get far away and it will calm down and stop attacking the trap.