It is fun and not too difficult, but it won't be cheap and it won't be fast. I took a beat up savage 30-06, removed the barrel and stock. I ordered a A&B barrel in 35 whelen from midway and a jrs stock from boyds. I also have a couple of semi custom wildcats that I bought from a friend. The problem with semi-customs is you spend $600-$1200 and end up with a $400 rifle. But they are fun and I am considering another. Maybe a something in 6.5mm. Mauser, rem 700, win m70, and savage actions are probably the most common actions for build-ups. Shilen, douglas, shaw, montana, a&b are common barrel makers. Boyds, B&C, Richards Microfit make various stocks.