There seems to be some confusion regarding the skeleton quest. Sometimes we are told that 200 are needed, and other times 400. Moreover, upgrades for skeletons are not counted towards the quest, even though this was taken into account in a similar situation in the third original campaign.
The number of scripts is indeed surprisingly good. However, here's a small suggestion: could you make it possible to decline the Vlad assassination quest and then return to it later? Because I entered the hut with a secondary hero and only one zombie, and you can imagine what happened next ;)