I have for a long time been dreaming of some sort of software for minecraft that lets me plan a structure and see how it will look before I go and spend hours of building something that looks like shit.
When I finally got my ass in gear and started googling for it it didn’t take long before I found Minecraft Structure Planner. It’s rather small and simple but it definitely does the job well.
You can design your own structure or choose from a range of templates, including bridges, domed roofs, spheres and so on.
It also tells you what kind of materials and how many of each you will need to build your designed structure.
Download from http://minecraftstructureplanner.com/