Getting back to the Directiva journey...
After some more iterations that were trying to use the Denovo cabinet and tradeoffs with the bracing and other extensive modifications,
@ctrl proposed a new cabinet. Now known as version 8, it reminded me of the Salk Veritas HT1 (which I happen to like and so we progressed with it). One of the primary questions was about beveling and whether the top of the front baffle needed to be beveled.
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If you look at the frequency range of 2-5kHz and compare the versions, you will see that version 9 (top edge beveled) has slightly wider radiation. While this difference is slight, would not have expected the result. Since it is better and a bit less work, the vote goes to version 8.
A couple of side comments. Small differences are a good sign as they suggest you are getting towards a point of diminishing returns.
The other note is a shout out to @ctrl for getting us this far this fast. Between expending his effort and computer time, we are much further along than if I had to build and measure all these alternative designs. If that were the case, you likely would not have heard from me until next year and/or would have a less optimal design!