Tbf, there’s a lot of r34 artists who know exactly how to extract assets, it can’t be that hard to Google ¬_¬
If the OP doesn’t want to use the tools provided, I hope they are prepared to make it a full time job. I once spent a 12 week internship writing the code to unpack the data files generated by MRI scanners and turn them into vaguely-interpretable 3d images. It was interesting; but I could have done a lot more if I had access to a library that already knew how to read the files. Working out which byte means Y axis isn’t much fun.