Not trying to preach but 2 things...
1. Shouldn't grow at the parents because if you get caught depending on the state and the amount found they're the ones going to jail.
2. I know you will most likely disregard #1 so, if you're going to do it do it proper. Don't tell anyone, if you tell your best friend and he tells one person and then that person tells another it gets out pretty quick.
Also, I would suggest looking into rubbermaid setups as totes can be purchased for $3-5 as a casing and have a low profile. Then you can fit soil lights and all in there. Considering what you did here DO NOT GO styrofoam- the other guy has a basic electrical/electronics understanding and some common sense: no offence but I kind of wonder after this for you. Principles are the same just w/ rubbermaid storage totes. Learn about LST and do it often, my guess is you're going to use bagseed so you definitely need to control height. Bushmaster is a good product to buy to do this also.
Have fun and better luck on your next grow.
-potlike