Planning is big part. Laying out things. I've taken to working out details in local server in creative mode to get an idea of how much space a particular structure might take.

This is a tower I used rock, glass and torches. Getting an idea by trying different things as I built up. Largely a layout of how much ground it would cover. Not only how it looks outside but inside from various angles.
Double height room
Two tier with gallery walkway.
Facebook photo album
I tried several styles and viewed at various times. Making changes as I went. Once I figured out how to build, it made the actual build quicker but few changes to use natural formations. Only pests like DMs mess it up.
What is your tips or experience on BIG builds?

