First build and design

Hello Everyone,

First time building speakers and thought I would ask the experts. These are for my desktop to replace my HK Soundsticks. Which I love and fit well on my no space desk.
The Particulars: Small desktop speakers, sealed enclosure w/ passive radiator. Listening mostly at low volume as near field monitors. I'd be happy if I can hit 80Hz.
The Box: 5"w x 6.5" h x 6.5" d Using 1/2" MDF 0.0700 F3
The Drivers: DA CF18N-4 3/4", DA ND105-4 4", and DA DSA135-PR 5"

https://www.parts-express.com/Dayto...me-Neodymium-Tweeter-4-Ohm-275-411?quantity=1
https://www.parts-express.com/Dayto...-Cone-Midbass-Driver-4-Ohm-290-212?quantity=1
https://www.parts-express.com/Dayto...-Cone-Midbass-Driver-4-Ohm-290-212?quantity=1

Forgetting the x-over for the moment and future sub build, does anyone see any glaring issues?
Thank you for your time.
 
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Thank you, Chris for the alternate suggestions.

I have not purchased them yet. Based on the qualifiers of my original post, such as environment, box size, and the selection of speakers in my list. I was hoping some of you would let me know if there were any glaring errors or poor choices.