nhibernate generate mapping files from existing da

Question

I'm working with NHibernate.

We have a huge existing Database (more than 1.000 tables). I want to map all those tables with NHibernate (with hbm.xml and cs files).

I tried to do the job with the NHibernate Mapping Generator, unfortunately the generated files are not able to compile. Too many little errors caused by multiple Foreign Keys related to same Table or Case Sensitivity (wrong namespace ,...) and so on.

So my question...is there a tool outside which is still supported and has a huge amount of setting-options? What about the Entity Developer (https://www.devart.com/entitydeveloper/)?

Is it a common process to map an existing giant database or am I doing something wrong?

Thank you very much.