I visited a club in New Zealand a few years ago for the IPSC Australasian Championship match, they are very good at using shipping containers over there, they has a shed set up with 3 40 ft containers forming a u shape which were al storage and in the centre was a workshop area for storage, fixing and maintenance tasks, the whole area was covered. They also had a few set up around the range area as smoking areas that had pallets set up inside as vision walls as it was a non smoking range due to it being in a pine growing forest, it was an experience going in there looking for someone as it was like going into a tear gas training room, no ventilation at all.