So using your designs Alex in conjunction with Chris's concepts I have started the mine structure. It is based on a system of internal structures sheathed within outer metal plates. there is an internal structure as well but this will be more determined by chris' storyboards.
You said the other day Andy that you wanted slightly clearer concepts of the mine facility itself as you stated that Alex's concepts were a little too ambiguous in terms of form and structure and lacked detail. To aid you in building the 3D model I have looked at Alex's designs and created a couple of concepts depicting the detail of the mine facility, showing the form of its structure from a front and side view as you requested. Hope these help.