Welcome to the boards tstone.

For your ventalation issue, turtles idea is marvilous. You could easily add a grate to your floor with 3-4 fans running in there. Either that or have you thought about drilling about 30-35 little holes using a 1" bit and using that black textile square shit they use for screens on a house, not sure of the name right now ... too high.

If you own a construction company, I would say that you could typically become one of the noblest growers on these boards using that container. BTW , If you run into problems with it, ship the container to me and Ill fix it. LOL jkn.

Anyways man, good luck with your grow. Can you get any pictures of your container, would help alot for some good desiging as most people on here have very unique/creative minds.