I've made a large base in one of my play through's. Initially I made an elevated fort connecting each rock to each other and then eventually added walls down to create a fairly large hall. Took quite a bit of time.

https://steamcommunity.com/sharedfiles/filedetails/?id=2587923580

Ignore the odd tower thing. Used a pine tree to create a watch tower with a platform / portal at the top - eventually got rid of all the scaffolding.