Can't thing of much else but any thoughts welcome
Wait to have it, and then you'll see if you want to add accessories. I've made some tailor-made stuff pretty nice for our M3W (you can have a look at them in my boring blog if you want to
www.speedymarmots.com)
I would immediately add:
- RAM ball mount for supporting the smartphone /and/or GPS.

- Under Bonnet storage structure is very useful

- If your life's at risk because your wife can't drive it

, the back cushion is mandatory (check mine, it's really wise - sorry I don't mean to be cool, but really it's wise

)
The rest such as the boot and bonnet locks depends on the balance between been valiant enough to drill your beauty and scared enough about the stealing-babbons. The luggage set if you're super posh but not Kardashian style, etc.