Combination of pieces

So I have a combination of rooms, hallways, and then just floor sections in different sizes, with side walls to add onto the more complete pieces.  I'm not sure if it's the best system but I like it and can add to it pretty easily.  A few new pieces are a T hallway with door, basically a 4 way intersection cavern style, and two wall sections, one of the a 'corner' with wall. Lol...More Special DB pieces coming soon.