Musician's Friend has that guitar listed for $1,349. My question would be what kind of tools do you have. If you have a full workshop of tools, I say it sounds like a great way to save money. I'll tell you that I'm almost halfway done with my build, and I've gone the cheap, cheap, cheap route. I've done most of my cutting with a $5 coping saw from Home Depot, a cheap third-hand router (that still runs like a dream), and just two router bits. My neck and body wood together were under $40, my hardware was probably made by 10-year-old Vietnamese children, and my pickups are used (from Craigslist). With all that, and mind you, I've got a lot more spending to do before I'm finished, I've still spent $775 so far.
The bottom line is that it may be cheaper to just buy the Godin. On the other hand, making one is more fun.
-Dave