I'm building my own house as I go with no mortgage or loan...have been working on it for 4 years. I have roughly 3 times in it what I could have just bought a similar house for (with the housing crash a few years ago) but it's my house the way I want it and I've learned a lot building it and I know every splinter in the place and I have a great deal of pride in every crook and cranny of the place...same with building your rifle. Can you buy one cheaper already made? Sometimes...but even if you spend more, you learn about the inner workings if you don't know them already and you have the satisfaction of knowing you built it the way you want it.
I really like that analogy! I am of the same mindset! I have never done it, but am very interested in starting as kind of a hobby. I love going shooting and love to deer hunt (I just started last year, and killed my first 8 pt. buck this year!)