Thumps up Mage. PM me if you want to catch up off camera on the current 76 quests. Love to say I'm here for the video. Really here to say you have some backup should you need it.
Nice job I saw you struggling with some snapping on that last building. Sometimes when you're trying to get a piece to snap somewhere it helps if you look away from the blocked snap point so the game "forgets" it's an issue and uses the other available snap points. It's tricky to get it done but I'm frequently amazed at how much the camera has to do with what actually works in game.
It too might be how the small floor parts are placed. Usually if they face the correct way it's easier to snap into place. Along with how you angle the screen like said above.