I am very happy you are okay. Also glad that truck wasn't sitting higher than it was. I don't know over on that side of the pond, but I did body shop consulting and insurance claims here for a stint. In the U.S., and as it seems evident from the other posters, they would total it out. The damage alone to fix it is almost at or above what the car is worth. As well if the person rear-ended you, I would counsel you to go through their insurance company and not yours. Well again that's if you were here in the U.S. In the U.S. there is no excuse for someone rear ending you but what the insurance companies like to do is pay you and make the other company pay them but by doing so they still assess you fees. I was rear ended in my Mercedes and the insurance begged me to let them handle it. I refused and said not only will I not take responsibility if you increase my insurance by one dollar USD. I will drop you. The claim was handled by the person who hit me insurance company. Almost $6000 USD. My insurance premiums went untouched and I never heard a word about it.
Unfortunately, I do believe that Mas. will be a parts car.
You could have a better view of this though you might have loved the car. In the U.S. when the car is totaled they give you the blue book value of the car. Which for an older Mas. is better because they don't usually sell at blue book value. If you had a bunch of mods done to the car of course this doesn't pay off but trying to look at the glass as half full. Additionally if you had FD DBW, or other things easily removed from the car you could take them off before the car is taking away. Additionally, you can take your check and buy another beautiful Mas. just like this and re-install the mods on that car. Sometimes a shop will work with you to do these type of things for you.
In either case, it is very sad my friend. I am just glad that you were not injured, the truck wasn't sitting higher, and that you are definitely not at fault in the accident. That was a very bad accident. Good luck on finding another car you loved just like this one.