I wondered if one of the MDF staircases might work, as stairs can be a right git to build.
And I know exactly how you feel regarding inaccessible upper floors!
I'm definitely thinking of MDF stairs for my next building. They are indeed a nightmare to build and the bit I'm least happy with on this saloon. They look wonky (reason why there's no pic from round the back
). If love to do a multi level staircase but my current skills/patience don't stretch to that
.