I have a poplar board on deck that I'll likely use as a body core. The 1/4" top and back will likely be something pretty and a little harder than the poplar (just for looks). The body will be plenty solid enough to hold screws/hardware and plenty stiff enough to not flex under string tension. It won't be feather light, but the poplar core will be lighter than a solid, heavier hardwood. And it will do its job, mechanically.
The neck will be laminated hardwood and regardless of what species make up the laminates, the neck will be stiff enough to not twist or bow radically under string tension and just flexible enough to adjust slightly with the truss rod.
I can accomplish this with many different types of wood. The end goal is falling withing a desired range of mechanical specs for the frame. Once that's achieved, you have a good platform for the strings to do their job. Then it's time to think about a specific type/brand of string, what pickups and the sound they achieve, their placement and any electronics in the chain.
I'm sorry, but whatever sound the body makes when you knock on it, while it's still a slab, has no real bearing on the sound coming out of your amp speaker. The "tone" it makes when you knock on it, doesn't tell you it's mechanical properties and how it will behave under string tension.
If someone can explain how it does (not a guess,....not anecdote,...not grampa knocking on table top and saying, "ya heard that? That's how ya know it's a good one!" And then getting all bent outta shape when you ask him to explain it....), I'd be more than happy to listen and learn. I love learning how things work and I have no problems being wrong.
But, telling me that someone knocking on a hunk of wood in a 15 sec video, with no explanation and then telling me I'm disrespectful because they build nice basses and I didn't just go along with it like a bobble head,....not gonna work with me.
They are nice basses. I do respect people that are dedicated craftspeople and invest in their work. That doesn't make anyone exempt from being called out on nonsense.