The experimental builder above makes random-map templates for Heroes of Might and Magic V: Tribes of the East 3.1.
It has been build as analog to generator from Olden Era we have here #Герои Меча и Магии: Olden Era — шаблоны для генератора случайных карт
The preview redraws as you go, and “How this will play” sums up the result.
You can also open an existing template and modify it.
Install: the template downloads as a .pak. Copy it into the data folder of Heroes V: Tribes of the East, then choose the template in the random map dialog.
If you find some issues or incorrect behavior, don't hesitate to write about it down below.