These are the items in the Rustic Buildings mod, with the types for those that have more than one.
The spawn codes for the gfi command appears in parentheses behind each item.

Rustic Wood Ceiling (ceiling_beam_d5)
...Catwalk
...Doorway
...Square
...Triangle
Rustic Wood Gate (gate_rustic_d5)
Rustic Wood Gateway (gateway_rustic_d5)
Rustic Wood Railing (railing_beam_d5)
Rustic Wood Stairs (stairs_beam_d5)
...Full
...Half
...Ramp
...Sloped Doorway
Rustic Wood Wall (wall_beam_d5)
...Doorway
...Full
...Half
...Half Doorway
...Sloped Left
...Sloped Right
...Window
Rustic Wood Floor (floor_beamrock_d5)
...Square
...Square Stacked
...Triangle
...Triangle Stacked
Rustic Rock Wall (wall_beamrock_d5)
...Doorway
...Foundation
...Full
...Half
...Half Doorway
...Sloped Left
...Sloped Right
...Window
Rustic Rock Pillar (pillar_beamrock_d5)
...Square
...Triangle
Rustic Shingle Roof (roof_beamshingle_d5)
...Corner
...Square
...Triangle
...Valley
Rustic Door (door_beam_d5)
...Ceiling
...Half Wall
...Sloped
...Wall
...Window
Rustic Window (door_beamglass_d5)
...Ceiling
...Half Wall
...Sloped
...Wall
...Window
Rustic Glass Ceiling (ceiling_beamglass_d5)
...Rustic Glass Square Ceiling
...Rustic Glass Triangle Ceiling
Rustic Glass Wall (wall_beamglass_d5)
...Rustic Glass Doorway
...Rustic Glass Half Wall
...Rustic Glass Wall
Block Wall (wall_block_d5)
...Block Doorway
...Block Spiral Doorway
...Block Full Wall
...Block Spiral Wall
...Block Window Wall
...Block Spiral Window Wall
Brick Smokestack (smokestack_brick_d5)
...Stack
...Top
Lighthouse Lamp (lighthouse_lamp_d5)

In this mod, stairs and railings are separate items. I split the stairs just because that made more sense to me than considering them a type of roof. The sloped doorway is included under stairs, because I often used them as ramps, but they probably would have been better as their own item. Splitting railings let me reduce the requirements for them, so they do not need as much as a full wall.