The Exhausters view picture here Before starting to strip the lower action further, take some time to inspect what you see carefully. Make some sketches of how the ends were done.
Lower actions tend to be of three types, with various hybrids.
Your objective will be to re-do what you see before you in a manner as close to the original as possible. These are the toughest to do and make look right. As the pressure to make ROs cheaper developed, the style evolved that used a single piece of rubber cloth, often with ribs inside. As time went on, the ribs got smaller, until in some late instruments there are none. This means loosening up the glue joint, although if the cloth is not too rotten you can sometimes just pull it away from the wood and it will come off easily.