Grow Box Specs

Hey i just designed a new grow box for my next grow which will be lowryderXsourdiesel, i was wondering if my specs sounded sufficient? the box will be 3ftwideX3ftdeepX5fthigh made of 1 inch thick plywood. i will have 4 passive intakes and 2 out takes with 4 inch computer fans, the fans will lead to a carbon filter. for lighting i have constructed a ring light consisting of 10 lights: (7)65k cfls and (3)27k cfls for veg and (6) 27k and (4) 65k for flowering. i will be doing DWC in a 20 gallon rubbermaid , i want to have 4 maybe 5 plants in the chamber, any input to improve on my design? sorry about no pictures.
 
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