It looks very much like the neck, fingerboard and tailpiece (including wooden post tailpiece attachment) are original, with only the pegs and bridge being newer additions.
Internally, there is a Spruce soundpost plate, spruce blocks and willow linings, which have been let into the top block but are butted up against the other blocks.
There are lateral braces which serve to support the flat back and little wooden cleats glued onto the inside of the rib above the ends of the braces, holding the braces down. These cleats may be original as I have observed very similar looking ones in other Eberle instruments, but it’s also possible that they have been added as a repair.