I thought I'd share some images of my low wall Space Hulk sections. Obviously there's inspiration from Willypold and VitruvianZeke, but I did want to show my solution to the 'ladder down' problem. The tiles are based on a 1/2 foamcore board, edged with a decorative corrugated paper. I created a 'hole' with a permanently attached ladder, and left the above tile unglued, so that it can be removed and replaced with a open hatch hollow square. I only have the tiles done for Suicide Mission, so I haven't actually made any 'ladders up' yet. I also built a control room based off the 3rd edition board section, with a recessed Adeptus Mechanicus machine spirit and a cogitator array largely composed of gothic parts. The illuminated texts that tech adepts would use are decals from the Sisters of Battle transfer sheet.
Thanks for looking, Dr.M