villagers build for you (read description)

I've seen similar ideas throughout the suggestion box. The developers don't want this because A) would be difficult to program, B) villages would get simply too big, and C) they don't want villagers mining for you. I agree with this, but after thinking long and hard I think I have a solution. Villagers would not mine for you, only build. You would have to collect the supplies for them. Nitwit's would be the builders. There’d be a senior builder, who you’d give coordinates and directions of what and where you want to build Can only use blocks. Can only build walls, ceilings and floors. You save time, but can still be creative. They would basically do the grunt work. This suggestion is not for small builds. I've always wanted to build something big in survival, but the size was simply too big. This could fix that. Comment, please!