The lightest body woods I’ve used are Paulowina, Spanish Cedar, and the super light varieties of Swamp ash. They all work, but yield a softer overall attack. I’ve had my best tonal success (while keeping weight down) by using alder or hemlock. For fingerboards; the softest/lightest I’ll use is Indian Rosewood…..and that is rare. I gravitate towards more dense woods for fingerboards for both tone and functionality.