You need to think about security of your container while it's being transported and when it's in use.
During transportation, you want everything secured to the actual structure of the container itself. I have dozens of tie-down straps
that I run between the anchor points on the container and/or to press anything I don't want moving against the wall. The CNC table has a piece of angle iron added between the legs and screwed directly into the container's floor.
Also, think about adding further lockdown to reduce theft. Nothing large was stolen during Shop-In-A-Box #001's time in customs, but pocketable things walked away. Someone actually stole the RAM out of one of the shop computers!
After deployment, a simple lock or 2 on the container door goes a long way. I've added the chain so that I can keep the container open a bit, allowing more air circulation while I'm gone for the night with the tradeoff of reduced security. We've also added a perimeter fence and guard (~$10 per day) to #001.
We've had one break-in to Shop-In-A-Box. It happened in Kenya; someone came with a gun (rare there) and threatened our guard. The robber got away with a smallish 12-volt battery from the generator and nothing else. Big, heavy tools are hard to steal on a motorcycle!