Hear me out lol so I just thought of this, possibly have a separate mode where we can create custom doors/windows and furniture..lets focus on doors for this example..

You start with a blank door and you are able to place glass on it and scale it, as many parts as you can fit, even different shaped glass (frosted glass too :) ) such as arched/circles ect..also door panels (those rectangles you see on doors to give it style, you know what I mean lol)..

I'm imaging it being like Spore, yknow when you drop a body part on to the body and it snaps into place and then your able to move it around and scale it lol..Anyway this system could also be used to make window and furniture (tables/ chairs/ shelving ect), blank chair, you select the leg style, how many legs it has by dropping a leg on it, are those legs angled ect, if it has a cushion or not, back rest style or no back rest (essentially being a stool)..Not only that, lets say when you put legs on it, you can also drag and drop various shapes on to the leg that snap to it and you move the shape up and down along the Y axis and you can scale the shape (you know how some legs have different styles), but they need to blend so it all looks as one as if it were carved ...( maybe this is abit too much but it sounds good in my head lol)

This would save the devs having to create alot of furniture content in the future and ofc who doesn't want to make their own furniture, doors ect??

Hope I made that as clear as I could lol