Luis—incredible car and sorry to see you let this go. I'm not sure if you're aware of this but there's a site called
www.bringatrailer.com where a lot of 1M owners have auctioned off their cars. Have a look at that and you can actually see the previous history of all the 1M's sold and their prices to give you an idea.
Here's an example:
https://bringatrailer.com/listing/2011-bmw-1m-28/
4K Mile example sold for $72,500 so yours could sell close to that range.
Good luck!
PS. If you happen to sell your aftermarket parts separately, let me know
