I know these following suggestions takes this project out of the eWave realm, but if I were to do this again, I would use this ribbon tweeter instead of the horn and CD.
1. It will be $40 cheaper.
2. It will not take up any space so the internal dimensions would be bigger so deeper lows with that woofer.
3. you wouldn't the extra horn compensation after the crossover.
4. it matches (mostly) the sensitivity of the woofer so no L-Pad required.
https://www.madisoundspeakerstore.com/ribbon-tweeters/hi-vi-rt1.3we-isodynamic-tweeter/