hey man i have a 250 w mh conversion and hps light were i bought from htg supply.And i was wonder how did you go about building your box because im about ready to grow mine?i was thinking about just putting 1/4 plywood boards together and getting some henges for the door.Put i dont know if making a frame first out of some 2x2s would be a better foundation and keep it standing better.i plan on growing 4 to 6 plants in it so my measurements were 23in deep,68in high,and 29in long.i also have to get a powerdrill to put bolts in and cut some 4inch holes at the bottom of intake and one at the to for and exaust.

p.s. what is your vent like do you vent 24 hrs or only when the light is on.