Bongo...
Glad to see someone step up and say something. However I have to say that I agree only to an xtent.
As a newcomer to indoor growing, You'd expect the person to be limited in knowledge, and experaince, and perhaps this is the way you responed.
IMO, once a person has the knowledge, then I see no reason why a cabinet (box) couldn't be built with wood. As long as you comfortable with your equipment., and design.
In bejay's case, I'd have to say that a 400w would leave me worry while I'm away from the garden though.
Ya might be able to do something with it, but call it a stress free garden might not be the case.
Good luck