Its just a box really. It has one permanent bed across ways and another removable one. Its big enough so that you dont feel claustrophobic inside it and also as aerodynamic as I could make it whilst still fitting my 6'3" across ways.
The gas cooker and stuff I just keep under the bed in a storage area. Ill take some pics when all my gear is cleaned out.
It cost me about $3000 to build and saved me over $4000 in accom this season. It costs me 3litres/100klm in fuel (0.79 gallons/100 miles) compared to when its not on and it just slides in, 2 man job, 4 bolts hold it down to the chassis. Takes about 20 mins to load/unload.