@DeanXeL Yep. That is how I’ve always done it too! 1) Make the floor cutouts a room, 2) remove their floors, 3) “explode” the room by removing the fences, 4) and then building the stairs from top floor to bottom. Removing the lower room’s ceiling will usually get rid of the gray squares easily as you’ve said. Sometimes I also use Xinqun’s spandrel technique too. Guess I should’ve backread before making my comment. ?
I am actually not aware (til now) of the current handrail/fence stair bug/glitch because I’ve never constructed my builds that way. I am used to Build-Buy from TS2 and TS3 and I always thought we were supposed to delete the handrails first before plopping down the stairs. Lol
Oh yeah, I have Seasons and I don’t notice my sims getting cold or hot when they are in the exploded rooms (which are usually just limited to the stairs and their landings or corridors). But it’s because I put a room on the topmost opening—not just a roof—to seal in the exploded rooms. I found that sealing the top still counts any exploded rooms under it as being inside and your Sims should be safe from the elements. You can easily test a room even without having Seasons by looking at the lighting (if it’s bluish or the lights auto-turn on at night, then it’s outside).
You are right in the friezes and trims being problematic with the exploded rooms though. But I just use the shift-click trick and paint the walls one panel at a time for those instances.