Please help with my first build from scratch- MTM

Hello all…been lurking for a few months…this place has been a gold mine of info. Thanks!
So I just finished my first kit build (Sambas) and I’ve got the DIY bug. I would like to build some MTM bookshelf speakers. Definitely LR’s and hopefully a center if that works.

Drivers:
Woofers: Dynavox LW6004HR-N
https://www.parts-express.com/Dynavox-LW6004HR-N-6-1-2-Honeycomb-Cone-Woofer-295-626


I really like these for aesthetic reasons and due to the manufacturer reputation and positive reviews.

Tweeter:
I wanted to use Dynavox tweeters as well but PE only has one model of their tweeter and it’s on clearance with only one in stock.

So I tried to get close to the woofer sensitivity and landed on these:
Morel MD 29
https://www.parts-express.com/Morel-MDT-29-1-1-8-Soft-Dome-Tweeter-277-010

Encloser: as far as material I haven’t gotten that far. I know I want large bookshelf that will go on stands.

Crossover: no clue! Hopefully I can get some help here 🙂

Questions:

1. Do my choices seem like a good idea?

2. How do I calculate box volume when using two woofers? Any help would be greatly appreciated

3. I’m hoping I can build a third for center channel…that’s doable right?

Thank you in advance!!! I’m not sure how this will develop but I’m determined to see this through till completion.