The problem with the Rayya's Forge is the gap between the red clay wall and the beams above it. The hearthlings don't build the scaffolding all the way up to the top of the wall because they need head clearance so they can't reach the little sections of ladder stuck under the beams.
Red Arrows are the problems. Build ladders where the yellow arrows are on the INSIDE all the way up to the top of the clay wall BETWEEN the beams. That should solve your problems here.
Next....you need a ladder so the hearthlings can reach the scaffolding around the back of the building on your other save.
Once that's done they'll remove the rest of the scaffolding for ya. BUT you have 2 more issues...
Build a ladder on the first floor up to the top of this pot so they can reach the ladder to place the lantern. Wait for them to get rid of the tall ladder then manually remove the smaller ladder.
This one I couldn't fix.
I tried undeploying the bed over it, the bed next to it, and the wall planters in case they were banging their heads and they still wouldn't place the floor tile. Hopefully someone else can fix that one for ya.
It can be frustrating, but hang in there. You're doing a great job! At the moment Hearthlings are a bit stubborn and like to do things in order. So if they can't reach scaffolding they wanna remove they give up unless ya give em a little boost. Sometimes they get a bit ahead of themselves and place things out of order, like the pot and the lamp on the first level. I just give em a pass for that kinda stuff cause they're so darn cute lol. Enjoy your game and keep up the great work!!