First off, welcome to TB. Second, You should design your bass build bassed on what you'd like it to have. Humbucker or single coil pickups (even hum canceling single coils). Passive or active plays a big part as well. But going on what you're saying (pop sound thats beefy with a growl and a touch of bright, I wouldn't know what to recommend for wood.
But if you draw your bass design and add notes on what you'd want it to have, (electronics and hardware) if it's string through or not, it'll get you started on how you want this bass to be. I'm 19 and i have a bunch of builds that i want to do (one got started but sadly its on the back burner for now since i have no funds). THe other builds i've written down what i'd like it to have. woods and electronics (but other bulds are mostly recreations i'd like to do).
Anywho, i'm sure a lot more people will see this and give you a better help on the wood choice and etc. But my contribution to this is start drawing. Doesn't matter the wood for now just get a basic shape to give you an idea of how it should look. if nothing comes to mind right away, don't get discouraged, Just choose a general shape to begin with as a base (such as precision or jazz bass, or even les paul, or really whatever is out there already) and design off of that. Change a few things here and there, cause in the end, it's your bass. Your design, creation.
best of luck
Enjoy the little things.
Epiphone club #112, thunderbird club member #151