Back in the 80's that was my after school job, nailing mole skins onto drying boards, usually 4 nails to make roughly a 4" sq and then air dry for selling to tanneries, no idea wot they used them for laterly. And no it's not been moleskin trousers for years. Not much demand for them now. In the old days u used to get a glossy magazine from the tanneries with their different prices for various furs and pelts
Air drying would not be much good for using the skins for clothing as dry hard but would be fine for fly tying or storing (Watch for flies/maggots as sometimes a small area turns/rolls over and stays moist and u have to fold/unroll it out)
Are the skins still in good nick and not starting to moult now, esp as far down as kent? Price used to vary at this time off year and to be honest skins were usually rubbish for 3-4 months throu summer. I'd wait till back end if ur putting some work into the pelt as fur is far better