Above you see the length of stairway and a platform. The prototype rests on a couple wood beams; I found some scrap brass to create these. Note: on the final model I installed "X" braces made of thin styrene. If I was smart I would've installed them at this stage. I added them later.
Some very finicky work with super glue and all was installed.
I also needed a smoke jack; The construction drawings call for a masonry chimney, but BG actually just has a steel tube flue. I used a cut-off shaft from a thumb tack, and a small bit of brass shaped with a ball-point pen to be somewhat concave ACC'd on top. The figure is part of a 1:450 Queen Elizabeth 2 sailor set, repainted into blue from his dress whites.
When installed, the ground level will go up to the top of the white foundation.