Buildings: open backs, stairs

[JohnnyBricks]

LEGO® sets were open at their back for playability. Upper floors didn't have stairs/ladder access.

I wanted to design custom buildings, open at their back, with stair access, and roofs.

Searching the Internet and YouTube, I've been unable to find what I'm after. Perhaps searching the wrong keywords.

Growing up throughout the 90s and early 2000s, I've preferred classic LEGO® parts.

Custom buildings:

• Open backs for playability
• Space for human hands playability
• Staircase for upper floors
• Ability to fit neat features inside

I've attached an example I've created.

Do you know of any MOC buildings fitting this category? Perhaps official LEGO® sets you liked.

A staircase needs a max area of 10 STUDs. 2 STUDs for bottom, 2 STUDs for top landing, 6 STUDs for the staircase part.

Edited June 11 by JohnnyBricks

[HibiscusDrive]

When I google lego open back moc, the images show a fair number of examples. 

[LEGO Train 12 Volts]

I'm very fond of the old parts

I like the '80s and '90s style of placing the furniture directly on the green baseplate

[Lyichir]

The tricky thing about having both staircases and open backs for playability is that increasing the depth of the building to fit stairs makes it harder to reach all the way inside even with an open back (especially with large adult hands). Your solution seems to work pretty well, with the caveat that those upper floor plates aren't supported by much and adding additional supports could reduce the ability to reach in easily. One other option that might be practical is having the staircase on a hinged section behind the rest of the building, so that there's a practical way to move between floors but the stairs can also be moved out of the way to more easily access the rest of the interior (I know some Lego Friends sets have done this while keeping an open back, and some sets like the 2012 Haunted House or the Ghostbusters Firehouse do something similar with a closed back, hinged design).