Ok, so this table is sort of a compromise. I have the official resin GW walls of Helm's deep and I wanted to use that in a 4x4 table. I also didn't want to do a dedicated detailed layout but rather something that would be easy to take apart and store. I also wanted the hill the hornburg stands on to be something I can use with other tables.
In the end this project ended up including bought pieces, 3D printed stuff, foamcrafting, plaster casting and all manner of terrain building techniques.