I'm trying to make a stealth grow box/cabinet. advice please!!~!!!

Im trying to make a stealth grow box/cabinet no bigger than 4 feet high and that could fit around 3-5 plants. this is the first time i'm trying to do this, I usually do closet grows so i have no idea what I'm doing at all. Please help with your experiences and advise, thanks!

4' is pretty short, is the area out of public traffic? What is your lighting?

it would be in my room, i have a 400w HPS but I can get something else too if its too hot. it can't be too big, i'd prefer it if it was mobile.

4 foot should do just fine, there are alot of ppl that worked with way less and got good dank buds. build the grow box to the dimensions of your choosing and go about it the same way you would if you where growing in a closet. like hook up air intake/outtake, oscillating inside, get some lighting to meet the amout of plants you have, ext.

not 100% on this, but I think 400 watt HPS will run too hot. It all depends on your ventilation, but usually from what I've read people with a short cab (4' or so) and small enough for like 4 plants usually stick with a 150 watter or a 200, something in that range. With only 4' to work with, even if you only used 6" for the pots, and 6" for the lighting and exhaust fan to opperate with, your looking at 3' of growth space. With that high of an HPS you won't be able to get your plants within around 18" or so of the light. That leaves you with 18" of grow space, a tight fit if you arn't used to training your plants to keep low. Possible, but better to start with low lighting (150 watt) and suppliment with CFLs to make sure you don't get a tinder box, imo.