Yea just surf some post even if old, lots of info here set my mind up to give it a shot at trying to grow indoors.
From what i have found out of just the grow hut/tent your imo better off price wise to just buy one then build one.. reason being i built one 6'tall, 6'long & 4'wide and lined it with Mylar 2mil film and used Reflex (insulation material)for the floor & ended up spend more $ on the home build then the one i bought (76"x76"x76") for $80.86 total..
Building your own can be rewarding and you have what you want.
Keep looking around the forums though plenty of info here.