I'm modelling a historic building and there are several windows like this that need to be modeled. I've tried using all sorts of combinations of casing/reveals/wall inset/niche to no avail.
The closest I have come I will put in a following post, but some guidance here is much appreciated!
If it's not possible to model the shutters, that is OK, but getting the reveal/sill/wall thickness right is the priority..