Ah, the old box sash window with 'checked' reveal.
Christiaan is right that the level of detail required isn't something that can be expected of a BIM window just yet. BUT checked reveals should be available, otherwise:
- the masonry opening can't be scheduled (it's different on the inner leaf and the outer leaf with a checked reveal)
- the frame appearance is completely wrong on elevation (the frame is mostly hidden with a checked reveal)
So how common are box sashes and checked reveals in the UK?...box sashes not so common now, but checked reveals are standard practice in Scotland.