I don't have this kit and nor have I seen it in photos, but I see that mention is made of Hotchkiss MGs. Mark IV tanks were not equipped with Hotchkiss, they all had Lewis MGs.
If you want to check any details, the only surviving Mark IV in original condition is the male tank, Lodestar III in the Army Museum in Brussels.
All other surviving Mark IV tanks have been messed with. (With the exception of "Deborah", who was blown up and then buried. However, she is very badly damaged so doesn't make a very good example to use as reference material. But as badly damaged as she is, you can still see that she used Lewis MGs and had armour at the rear, over the petrol tank.)