More than likely you will need to contact your local building inspector and start there. As what you are planning on doing is to build a brick and mortar restaurant kitchen inside of a van body which, in the states, falls under the building dept. for inspections and permitting. I would start there and maybe they could direct you to someone who has done what you are intending to do. As far as on this site, there are plenty of build threads going with many pictures. Check the Hot Dog thread, there are more than a few there and one was active just the other day.