Deerskins are very difficult to do apparently because they have a thick hide with a hollow between the layers. This makes it difficult for the chemicals to penetrate and also hard working over the skin to keep it supple afterwards.
I have a short rabbitskin cape which was my mothers (so at least from the 1930s) and it's gorgeous - soft and cosy. I haven't tanned any myself so will be interested to hear how you get on HesterF, and oor wullie with the deer.
I did once try moleskins when our mole man caught lots. I salted them while I was thinking about how to do it, and layed them all out to dry, but something stole them. As we had a rat problem at the time we think the rats stole them to line their nests

The moles are back this year so maybe I'll try again.