A month or two ago, I bought this model from someone on Scalemates:
Yes, in the state you can see it in the picture 
The box does contain almost all of the broken parts, like the hatches, aerial mount, etc. Only the mud chute for the right-hand side is missing entirely.
This is the AFV Club kit of the Churchill Mk. VI, and the problem is that it has one major error: the designers misunderstood how the lower part of the turret of the Mk. VI differs from that of the Mk. IV on which it is based. The armour around the turret ring has been strengthened, but instead of only making it thicker, the kit also made it higher, which makes the whole turret too tall. Correcting this isn‘t very difficult, and luckily, the box gives you a part that you can use to do that with.
Next to the constructed turret is a second lower part that comes with the kit — namely, one for the Mk. IV. The difference in height between them isn’t that obvious here, but the next photo shows it well:
My first problem was the get the lower turret part off. Happily, the previous owner didn’t use that much glue, so that I could get the right side loose with a heavy-duty knife and some care (both for my fingers and the parts), but I had to saw through the left-hand side. More stuff broke loose in doing all of this, but that’s not an issue:
This lets me show the difference in height from another angle too:
The Mk. IV turret has a part on the rear end that sits lower than the rest of it, but the Mk. VI doesn’t. First real task, then, was to remove that:
This was not that easy a task, but I managed it by cutting and filing. This does make two slots appear, which I first filled with some plastic strip and then puttied over that. The wider turret ring can be built from 1 × 0.5 mm plastic strip: wrap one around something that’s about 46 or 47 mm diameter and cut it to length; then glue the ends together by sticking a second piece over the join (on the outside!) and continuing that around the whole of it so you get a ring of 1 × 1 mm square material. You can then glue that to the turret, centred on the moulded-on ring, and once the glue has dried, cut off the section that sticks out on the right-hand side only (not on the left!):
After that, I used putty to fill the gap on the left-hand side between the new ring and the kit part, and also smeared thinned putty into the seam along the whole length of the new ring, to blend the two together:
And now I was doing this anyway, I figured it would be fun to give my Mk. VI the turret of a Mk. V. That was a version with a 95 mm howitzer, and its turret had a square opening in the front while the Mk. VI’s had the upper left corner “cut off”. Looking closely at photos of real Churchills, you may spot some with a 75 mm gun in a square opening — meaning they’re Mk. VI tanks built on a Mk. V turret shell.
The AFV Club part even shows which bit to remove:
This, of course, is because AFV Club also has a Mk. V kit and appears to have used a modular mould for them. Anyway, a bit of work with a small saw, a knife, and some files later:
