I need someone to come up with a solution on how to hollow out these logs.. I want just 0.5mm wall thickness for the entire log

Hi! I need two things.. A plan on how to hollow out these logs. Locally within China. Someone might be possible, some due to the shape are impossible to work on.. However, for the most bit, I just am looking for a technical solution as to how to hollow these logs out. And, I want just 0.5mm thickness THROUGHOUT the log, the length of the logs is generally quite long - up to 3m.. And generally 2m+ I have many solutions in my own mind right now on how to do it but I am neither an engineer nor a wood working expert. So, I need an expert to give me an idea. The dimensions of the carved log will have to be estimated to create the plan, but the rough dimension would be 12 inches; longest distance between two edges, and, the shortest distance between two edges would be ≤3 inches.. The pictures can explain the rest. Please see the videos, the photos, study everything and let me know if you can come up with a solution to hollow out these logs. Need this done locally in China, and, I also want a design and basic machinery setup details of how to do it elsewhere. But I'll be doing a few test pieces in China. Perhaps about 100-200.