That box looks fine to me. Idk I don't like JL's higher tunings, that box may be at 36 hz or whatever. I don't like that type of bracing either, personally, at all. To me, that's like the worst way to brace a box, the flow of that just doesn't look good to me, but I'm sure it works fine. I also don't like the port splitter, that's just wasted space and usually the port will perform better, the closer the height and width are to 1:1 ratio. Having that splitter makes the 2 ports really skinny, instead of having 1 fat port.
With all of that said, that's still a fairly nice box. I custom design, I get a lot of info from you and I'm designing the enclosure based around your ears, the subs (and total system dynamic), plus the location of the box in the vehicle. So I put more thought into it than just meeting the requirements of the manufacturer. So just let me know, no worries