It is definitely possible man. I'm about halfway through my first build and managed to keep the basic rifle assembly itself under 800 bucks. A good quality, simple lower should run around 100 dollars, I chose a Stag because they're a local company with a good reputation and offer discounts to dealers in the area. From there, I went ahead and ordered a Del-Ton rifle kit (http://www.del-ton.com/AR_15_Rifle_Kits_s/1.htm), based largely on the recommendations of other site members. They are a sponsor and have an excellent reputation for customer service according to everyone I talk to, so I'm eagerly awaiting delivery. Other than that, you'll just need a punch set and a few other incidentals, but nothing that will break the bank. If budget is your primary concern, just stick to the meat and potatoes of the rifle, but good luck trying to ignore all the cool aftermarket accessories.