I leave my shop door open in the summer and to prevent the flies buzzing my shop and skins I use salt!
Pin the skin to a thin board and salt it down real good!
After a few days in the hot building the pins are removes and the skin is scraped free of salt.
Wait till the wife aint looking and sneak the skin to the bathroom sink and shut the door. If the wife asks,,, tell her you're shaving or something to keep her at bay.
A good dose of dawn dishwashing liquid and some warm water will remove the remaining salt and some of the skins natural fats that may hinder glue performance.
Now it can be patted dry with a paper towel and returned indefinitly to the shed. You can let it dry out if you wish but you'll need to soak the skin agin before applying it as a backing. It needs to be wet and plyable to form well to the bow.
The wife did catch me and would not let me bring it back in the house. Had to use a bucket in the shed.
Looks like I't will fit a locust stave,,, black snake on black locust?
Outline the bow on the skin a tab bit largere than the bow.
Trim out along the lines and get the pattern centered down the back.
A little Acetone to prepare the wood and remove dust, hand oils, etc.