Regarding the canvas cover between the hood and cab, Tamiya chose to mold what looks like sheet metal with rivets.
https://flic.kr/p/2cZ3858][/url]Flak-13 by N.T. Izumi, on Flickr
https://flic.kr/p/2cZ38aD][/url]Flak-14 by N.T. Izumi, on Flickr
Comparing the kit to the box art, it is pretty easy to see what I'm talking about.
So anyway, there are lots of ejector pin marks and mysterious, deeper, smaller holes to fill inside the cab before it's glued together. Some fettling and sanding of the floor board was necessary to get the cab sides to fit. I really don't remember having any of these problems 40 years ago.
Closer inspection of the front grille reveals "Krauss-Maffei" lettering - something not seen in these stupid, greedy, trade-marky, license-obsessed days.
https://flic.kr/p/2eifvZU][/url]Flak-15 by N.T. Izumi, on Flickr
But mum's the word, okay? We don't want to set off the clittering hoofed lawyers clutching C&Ds to Tamiya headquarters. Mum... Mum...