Ah, OK, I didn’t look too closely at those because I was discarding them anyway to convert the hull into the American type 
That they didn’t include much of the gun mount detail, I can sort of understand. But why there’s not even a part to close that huge gap is probably the strangest thing about that kit … It’s even worse than Tamiya’s old missing sponson floors, because at least those are only visible from underneath while this gap is on show to everyone who looks at the model from the left.
Still, the gun mounting is missing so much stuff it’s also almost hard to believe.