Insulating Stress Panels composed of 1.5" Polystyrene insulation board surrounded by a frame of 1.5" x 1.5" Fir. Everything skinned on both sides with 1/4" luan plywood. Strong, relatively light, very well insulated. Panels are joined to one another with 3" wood screws. Panels can be disassembled quickly and easily.
Interior dimensions - 31" Wide x 17" Deep x 45" Tall
Active Exhaust to roof vent. 6" rigid ducting with 424 CFM inline fan on diy speed control rheostat. Passive intake using 6" flexible insulated ducting. All air brought in from a heated and air-conditioned room, thus box is effectively heated and air-conditioned also.
250 Watt HPS with remote ballast (outside of box) 250W Metal Halide conversion bulb used for veg.
40 Watt total 24" T12 fixture. This probably does very little, I can place it in/under canopy, also provides different spectrum than main light.
Moveable Hood/Divider. - Effectively separates bulb heat from plant area. Bulb also shielded from plants by double strength glass. Holes drilled in divider to direct air flow.
Air circulation - 9" oscillating fan (may have to eventually be moved to underneath canopy as plants grow toward max height)
Vegetative Pots - approximately 1.5 gallons. Cut down from paint buckets. Screws around outside lip are for eventual LST.
Drain - (can't really see it from pics) Pots are over a drainage tray that is plumbed into air-conditioner condenser drain. I can overwater and flush without moving plants from cab.
I regret not taking pictures during actual construction, but I was in a building frenzy.
Here is the closed cab (door is fully removable). I always keep plywood scraps, etc. in front of cab for more camo.
Here is open with the pots moved out. Can't see much with all the lights blowing the picture out.
Back of Cab. You can't see this side from the attic entry/storage area. Just put it up to show you the venting. Slim vertical ducting in middle is unrelated to cab (water heater vent)
This gives you a better idea of the inside. It's painted flat white all around. Hood is adjusted with chains, side lighting is on light yo yo's. Veg pots with screws can be seen.