I would land the TTs during the refit a 14inch ship doesn't need them IMO and all IJN ships are overweight and you will need more top weight for the massive numbers of 25mm.
Pretty much what I've thougt but I was still undecided about them. You and Bezo nailed me to the proper path.
Nedless to say, torps removed from the 1941 fit.
I'd delete the unnecessary 'A'-class cruiser-style midships sponson, since here, your freeboard is adequate. If anything, you could add some more deck-space in the hull, since right now, it looks cramped (even more so than usual IJN-style!) for a BB or BC. And, while using the Takao-class Green house tower complex is nice, I'd add a few more levels, just to make it look more, ehhmm...battleship-like!
Well I could still use it to get some more belowdeck space for crew and storage, although it cannot be glimpsed by simply looking at the drawing, beign the Kawachis 8 full meters beamier than a Takao I have some 480 square meters more of deck space just between the catapult and the bridge. A full-width deckouse can be found on the British Battlecruisers renown and Hood, the IJN progects for the Amagi, Kii and N°13 classes featured something similar, and the US South Dakota had a very wide one too. The kawachi class could be considered more as a well protected Battlecruiser than a true battleship after all, that's why I was inclined to give her more of a cruiser-like appearance than a true BB-one.
The bridge is just 4 feet lower than the one planned for the B64 class Super Cruisers/Battlecruisers, though I could make it a full deck higer in case I'd want