Summary

The 10 mm square pipe is required for assembly. Also, many M3 screws are required.

[10mm Square pipes]
Length , Number
114.000 , 2 ,
134.000 , 2 ,
242.000 , 2 ,
292.000 , 2 ,
total , 8

https://denshiman.com/robot.html
https://denshiman.com/10mm_square_pipe.html

https://twitter.com/imaicom/status/1279464064209453056
https://twitter.com/imaicom/status/1279697470751076356?s=20