Re Mohair Roof Lining. It is worth asking. Our 1st 4/4 with Black Hood had White Lining. The Roadster with Green Roof has Black Lining.
Personally I preferred the White Lining as it is less claustrophobic on the rare occasions when driving with the Hood Up, particularly at night. You just have to keep it clean.
Maybe worth considering an Under Dash Flexible Arm Map Light, fitted to our roadster by the factory, which is useful at night as an Interior lamp.
The Centenary Pack included a Dash Badge of the Centenary Design but it may also be worth considering a fitted Clock there.
We don't have Heated Seats but as we find the shape of the seat uncomfortable we use cushions and I use a Lumber Pad, so it may be worth investigating extra Seat and Lumber Padding in the hollows which some owners have had done afterwards by Allon Whites.