Staircase for TTCombat Building

This is my first design from scratch, so I'm sure it isn't the best. Comments are welcome.

I have the TTCombat MDF buildings and a lot of them don't have much interior design. The ones I have don't have staircases, but they have holes in the floors where they might go.

After searching for something workable in the 3d printing community, I finally decided to try and make a set myself.

These are 30mm wide, roughly 65mm high and have little cut outs on each stair to fit the bases of a figure. The cutouts are 6mm high and 24mm wide to fit 'normal' sized figures on 28 and 30mm bases.

I printed this on its side with no supports, but I've uploaded a file with it standing normally if you want to give that way a shot.