Wow... That is really wrapping her up for the winter!
I didn't go quite that far with mine because I hope there will be some nice days where she can get some 'exercise' over the winter.
In my case, I left the battery in, but installed a charger / maintainer / desulfator from BatteryMINDer to keep the batter in top condition while still in the car.
Check out my project post here:
Rather than a Car Jacket, I use an indoor car cover to keep any dust or dirt off. That way if I want to take her out, it only takes minutes to get her ready.
Finally, after hearing of horror stories from other owners about mice making a home in their collector cars for the winter (and doing LOTS of damage), I bought several moth ball cakes encased in plastic with a 'coat hanger' hook on the end. These I hung on both sun visors much the same way you would hang them in a closet to protect your clothes.
In my other collector that sits outside (an 89 Celica GT drop-top), I put two open boxes of moth ***** on each of the front seats. I figured the outside car might be a little more 'exposed' to any traveling rodents than the C4 is inside.
Love your storage post.
Hopefully our winters will be mild and will go by quickly.