New Grow Design Ideas Please

I recently found a new location to grow my medical.
I can only have 12 plants. I have a budget of around 2000.

I was thinking of making a drywalled 7x7 room with a plastic liner. I want to grow soil.
Lighting would be 3 600w air cooled reflectors. Should I go 8" reflector or would 6" be fine for temperature purposes? I will probably have to get a bigger carbon filter; I have a 400 cfm Phresh filter now.
Any ideas? This is just something off the top of my head.

:eyesmoke:
 
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