mine is almost done...
figure on AT LEAST $150 for a barrel.
$200 or so for drilling and tapping, bluing, installing and headspacing the new barrel.
another $150 or a little less for a stock, depending what you want it to look like.
plus the original Mauser you start with as a donor.
so you end up spending north of $600, which is about exactly where you can purchase a new remington, winchester, or browning which is probably nicer than your custom. that is, unless you are skilled in this area and can do the work yourself.
i did this as a project for fun, and to learn from, and to have something i did FOR myself, BY myself.
Don't come into it thinking, like I did, that you can create a nicer rifle, cheaper than you can buy one. i was wrong.
-Matt