3-way floorstanding with KEF coax (active)

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Would you change the position of the woofers? decreasing the space between them maybe?
You can not know the effect without some modeling in some specific software. I'd be looking at what kef did
Is the bracing enough?

Find a way to connect front and back baffle. Few struts to connect them will do the job. The way you have it now - they are supported where they need it the least, at corners. You need to connect opposed baffles at spots that are at the middle of the baffle width.

Similar to this:

https://www.audiosciencereview.com/forum/index.php?attachments/img_20211009_162418-jpg.161467/

There are also large unsupported surfaces on sides.
 
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That was my 'pro' setup for a few months!

Eventually, I put it in a metal box. with a laser-cut top.
View attachment 1053299

Is the fa123 going into the speaker or an external box? The "bud industries ac-411" fits it if you go that route.

The hypex software is for sure clunky.
The Module will be in speakers, a separate chamber will be build in the back at the bottom, as u can see in the 3d model
 
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This image gives a good indication of the relative merits of different bracing on flat panels, the full lengthwise brace being the most effective of the options shown.

When you tie the brace into multiple panels like a dadoed window brace it becomes significantly better. Predicting that needs much more complicated equations or modelling.

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In long tall structures window braces can quite effective. Like in the images attached, I did a bit of constrained damping in the channel with some bitumen type material and flexible glue.
 

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I'd consider braces with smaller round openings. The idea is to connect opposing walls and connecting walls both at the same time. At an height of 1100mm I'd add at least one more brace. And how are you going to connect the woofer magnet assemblies back to back?

@woofer spacing: I'd take the profit of spreading them wide apart. That way the system supresses vertical standing waves in your room a bit more than with close spacing. The KEF Muon and a lot of other systems use that approach.
 
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Spacing is probably with wavelength, I suspect all five drivers are about 1/4wl away from eachother at crossover frequency. For 200Hz this would be roughly 40cm. Or conversely, if your spacing is something the crossover frequency is best put abput wavelenght 4x the distance from mid to woofer, or from woofer to woofer.

There is opportunity to affect pattern with this driver configuration, perhaps they do but I suspect the blade is just ment to be a point source with very low diffraction, hence woofer are not on front and not on the mid elevation but above and below.
 
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Very high technology, nice. This one has bit different spacings / locations for woofers that the blade. Hard to tell why, probably optimized with measurements for nice polar pattern, or any other reason hard to speculate from pictures only 🙂 is there klippel set available for the blade or this new one? would be interesting and fun to speculate on 😀
 
Very high technology, nice. This one has bit different spacings / locations for woofers that the blade. Hard to tell why, probably optimized with measurements for nice polar pattern, or any other reason hard to speculate from pictures only 🙂 is there klippel set available for the blade or this new one? would be interesting and fun to speculate on 😀
Here is their white paper.
At the end is the spinorama. 😀
https://us.kef.com/pub/media/ls60-content/LS60W_WP.pdf