This is properly obsessive tuning. Nice work!
Apart from the cranks, I can't see something that is way too light for its geometry or material when you are a smooth rider and don't do much wedging (shorter-than-wheelbase obstacle between the wheels).
I don't know anything about the rear tyre or these forks, just that Hashtagg went way lighter than this with their new disc forks.
The brakes will leak, of course, but no one produces rim brakes with Magura-die-casting quality nowadays.