Bipedal walking unit for Stackchan

UPDATED:
Leg_L_v2.stl and Leg_R_v2.stl are re-designed to fix SG90 servo using screws. you can choose either of the new or old ones; however, the new one is easy to be 3d-printed because of less overhung.

This is a set of option parts for Stackchan, that gives Stackchan bipedal walking ability.
Stackchan is originally designed and developped by Shinya Ishkawa (@meganetaaan).

See the following link for details of Stackchan: https://github.com/meganetaaan/stack-chan

This model requires:
M5Stack (Core Basic, Gray, Go, Fire, Core2)
Servo module for M5Stack
M5Go Bottom or GoBottom
SG90 servo motor (x 4)
M2x15mm screw + appropriate washer

Stackchan Body for SG90 and Go Bottom (https://github.com/meganetaaan/stack-chan/tree/main/case/contributed/mongonta_case_for_SG90_and_M5GoBottomBoard/case_for_SG90andM5GoBottomBoard)

[Note]: Servo Module for M5Stack is not available (EOL) in M5Stack official shop. Unfortunately currently available Servo2 Module is not suitable for thi