The majority of the layout resides in a bookcase/wall that separates my modeling area from the laundry room.
On the right half of the scene you are looking out through the machine shop at a ship bringing in supplies for the laboratory.
Only part of the ship's hull fits into the scene.
The left-half of the scene opens onto a wood and sheet metal building that extends out over the water.
The main floor serves as an assembly area with offices and a design studio above in the loft.
In the laboratory all manner of rocket parts, perpetual motion machines, and robots will be in the midst of fabrication.
Track runs through all of the building facilitating the transportation of various components,
to the test site and launch pad by a small industrial tramway.
The tramway also serves the small observatory out on the eastern point of the island,
separated from the main island by two deep channels.
To keep the layout from filling up my small workshop I fabricated steel bridgework that hangs off of the wall structures.
The bridgework connects the scenes and gives my models a bit of running space.
If all goes well there should be some photos below.
The layout is 7/8ths scale.
I almost went Gn15 like you did to get more modeling into my space but my eyes thank me for the larger size.
I will post some more showing how I make bricks.
In short I made a latex mold and cast them in plaster with concrete dye for coloring.
The dye works well and I don't have to worry about scratching the color off of the bricks.