right where do i start. the box idea i would scrap coz it would'nt be worth doing. if u have a wardrobe in ur bed room thats a good start coz u can put a lock on it so no one can get in it and as for light its easy to rig up quite a few cfl's and do a grow that way. i hate to see people wanting to grow but cant coz of complications. there are always ways round every thing just remember that. i would'nt use tin foil either u can get one of those emergency foil blankets there only about £10 and they work great the problem with tin foil no matter how flat u have it is it causes heat spots due to the intensity of the light and it will fry ur babies. i really hope u manage to do it man any way ive gave u a few suggestions i hope they help laters peace!