Hello Angel LM!
When I was looking at the BOM, I noticed that articulation 2 & 3 motors had a toque of 121.2 N.cm and a length of 34 mm and articulation 4 & 5 & 6 motors have a torque of 26 N.cm and a length of 34 mm. According to the BOM, articulation 1 motor has a length of 40 mm, and a torque of 40Ncm. When I clicked on the link that you included in the post for articulation 2 & 3, the holding torque without gearbox was 25Ncm(31.2oz.in) and had a length of 34mm. Additionally, the link for articulation 4 & 5 & 6, the holding torque was 26Ncm(36.82oz.in) and had dimensions of 42x42x34 mm. Additionally, the link for articulation 1 motor stated that the holding torque was 40Ncm and the dimensions were 42x42x39 mm. For all the motors, I noticed that the current(A) was 0.4 but I could not find where the voltage was listed. I just wanted to clarify that the links to the motors you provided were the correct ones. Thank you!
Wren