Internal Staircases in models

It would be great if you could add internal staircases and openings in the floors of earlier models, like the Winterdale buildings.
I’ve got around it sort of by 3D printing something from another range, but I’m sure you could do a better job.
You can see what I mean on my hobby blog post about the Tavern Kit.

The One Eyed Rat… A 3D Printed 28mm Coaching Inn – Sally 4th