The REW room simulator tool overview :

Most spaces are way too complex to be simulated by this tool. You can only silmuate a perfectly square room with 90 degrees aligned speakers If you are designing a recording studio this might show usefull, but in every other situations it's overkilled regarding of time and energy spent, and underdeveloped in terms of possibility.

However, i found very interesting the possibility of messing around with different sub configurations and their impact.

A good toy to learn, but not very practical for my prestations. Maybe later I will use it properly and be able to use it professionally ?