As far as I know, its 3x3x2 and garage cannot be built outside (separately). Those bases are in Yukon pve6 for a long time (1month ±). are there any changes made in rules? if there is then what is the new base size limits? Yukon PvE6 Location: Kluane lake, Quill creek.
Look at the sticky post at the top of this topic. It's explained right in there. 20 cubic units, no detached structures. https://justplayhere.com/threads/justplayhere-stuff-explained.17680/