I'm trying to use concept of layout, but sometimes this is impossible, like this time. Basic layout was created by another mapper, but this was... a dm map.
)))) So, there is no any concept. That map was a bunch of brushes with couple of static meshes. All except layout of one base was made by me.
Previous map, DM-Aeris was created with layout concept and design document.
ps
Sorry my bad English.