That is just droolingly well done; in every way, shape, or form. Everything is unique and explicitly executed; can't say enough, but don't want to give you the big head. LOL
That ancient spruce is a knockout; what a fantastic find and treat for you to be in the right place, and right time to procure it. Nice choice on rosette, and I like that is cut on differing sections. Ditto on the sides and back wood. I also like seeing guitar-like pins on the bridge; how are the strings knotted or secured under the pins? (I've seen beads used on another ukulele bridge; was thinking about cutting that part off old guitar strings too).