I would try to not overthink the tonal qualities too much and some good recommendations have been made. Make sure the bass fits you, is as comfortable as it can be. If it fits it will sound good too, you play better on a comfortable instrument.
If you have someone building the bass for you I suggest you talk to that person.
If you build it yourself then go with alder, maple neck and ebony fetboard because you like it and while it might not be perfect in the end, it won't be a terrible choice for sure. Building a bass is always exciting and overwhelming and you want to get it perfect but it is a learning curve and you have to be prepared for things coming out different than what you imagined.
And try many different strings, I believe they have the biggest impact on the sound of your bass.
And welcome and good luck with your project!