A She Shed log cabin doesn’t always require an internal wall lining as the solid wall structure are different to widely used timber frames on other sheds. This is a great advantage on the solid timber cabins.
You are welcome to install wall lining if you wish, it’s not complicated to do and can be used for extra insulation as well for decorating such as hanging up wallpaper etc.
If you are wanting to use your cabin for a sleep out, here are a few ideas below for insulating your cabin or shed but if you talk to your local building supplier they will be able to give you many more options.