i've got about 500$ in my 10/22 minus the scope, i've got a fluted bull barrel, houge stock and several internal pieces, did all the work myself and this is my favorite gun to shoot, cheap, accurate, and no side affects, recoil/noise.

barrels and stock are simple, i would start there, look at the other pieces and get real freindly with a smith, most of the parts are very simple and may only require a little honing, but you may still want to let the smith handle the touchy items.