In ancient times, stone gates carved with many boxes were used as courtyard gates in rural areas. Will it affect Feng Shui?

The door of the house is a geomantic eye, which has a great influence on a family's geomantic omen. Unless the stone door you mentioned was removed from your ancestral home, it is not recommended for you to use it. Regardless of its origin and provenance, please use it with caution in general. The reason is simple and clear. Old things have a lot of gloomy atmosphere, so it is not appropriate to use stones as the material of the gate. Please weigh them more.