Update
First off, I purchased the flatpack kit for the NX-Oticas way back around the time covid starting causing supply issues. After some time waiting for parts availability, I lost ambition to pursue the project. I had the boxes stored in the basement for roughly three years.
In the meantime, I spent a lot of time tweaking my Emerald Physics EP-4.7 speakers with miniDSP and even tried Dirac Live. Though these speakers do some things very well, Dynamics, imaging and soundstage and you dont need subwoofers for strong decent quality bass. Though I did use a pair for the lowest octive mostly for movies. I just couldn't achieve very good tonal balance and resolution.
So I gave up on MiniDSP eq efforts and decided to go ahead and buy the NX-Otica parts kit. The only regret I have was waiting so long to do it! Even without doing much positioning or sub tweaking, just started where I thought best. The sound from these things is beyond my expectations already. One things for certain, I won't be looking to upgrade speakers, probably for the rest of my life. Well, maybe a pair of GR subs eventually.

Oh, plus you get the satisfaction and sense of pride from building them yourself.
Thanks Danny for designing and making these kits available and to those who helped me with my questions.