Do go for the mohair toneau, not much over the pvc variety but soooooo much better.
Do not get the immobiliser or the intercom system, both a waste of time.
Heated seats weren't an option when I got mine so I use a motorcycle heated waistcoat, keeps your front warm as well.
The jury is still out on the photo build book, expensive but nice to have even though most of the photos are library photos, could be any 3 wheeler really especially in mine case where the last photo is clearly not my car as it has the wrong exhausts on.
Brooklands steering wheel would also be high on my options list were I to be placing an order now.
The hardest part of pre M3W ownership is choosing the colour and spec. as there are infinite possibilities.
They used to say there were never 2 identical Landrovers ever produced, I bet thats true of the M3W.