Allgrownup, and anyone who wants to grow in a container, i strongly advise you not to do so.
Im not even using the entire containe for growing, just alittle area in the back with 4 plants. The front of the containe i built a wall on one side of the opening and on the other is a door that locks, plus the container door shuts over it and it gets lock also.
If you were to use a container to grow, you would *need* to do this first. The reason i say not to grow in a container is because its metal, so when it gets cold, it freezes in there. when its hot outside, it melts plastic in there. i have 1 1000w HPS and the temp gets over 100F easy. And i have 4 fans blowing constantly, im just lucky my plants arnt burned. Also the inside isnt really great for reflection as you think, you would still want to put up some reflective material.
Reason why im moving into a trailer?
safe, easy, managable, got the trailer for $50, portable for when i move, and have you ever seen a trailer built into a growroom? lol