I'm building up a very nice 51-style fretless bass with a highly figured korina body and a bubinga neck/fingerboard (photos to come shortly) Ive been finishing the body with Tung oil. Warmoth says the neck doesn't need finish, but I assume a bit of protection wouldn't hurt. A bit of danish oil? lemon oil on the fingerboard alone? Rub on poly? Im stringing with flats or tapes.