They have expanded their line from Complete Corridor Sets, which come in two flavors the Corridor Starter Set or the Corridor Advanced Set. Specialty Rooms, which has the Airlock, Cargo Hold, Narrow Side Room, 4-Door Side Room, 3-Door Side Room, 4-Way In-Line Room...well you get the idea! Specialty Corridors, which has the Interior Wall Pack, Stairwell Addition Pack, Wide Corridor Pack, Wide T-Intersection, the Wide 4-Way Intersection and more. The Bug Hunt Roofs with either the Starter Set Roofs or the Advanced Set Roofs along with roofs for all of the specialty corridors and rooms. Their line is incredibly complete and offers the discerning buyer the option to realize whatever sort of layout that they can envision!
If you are not familiar with Scenery Express they carry a huge selection of materials for building model railroad layouts, which works great for wargaming and RPG terrain. When in doubt, stick with O scale products as it is far closer to our 28mm miniatures. I have done business with them on more than a score of occasions and never been disappointed!