Here's a good start for you, although I never mention how I came to that particular pattern.
>
I have built nearly 260 guns, and I have drawn out a pattern for each one before I begin.
You need to have all your parts first and some paper big enough to draw out a full size pattern.
Measure you barrel and transfer theose measurements to the paper. then figure the web between the barrel and RR channel to be 3/16". Then allow for your ram rod and 1/8 on the bottom of the stock.
Then figure out where your vent hole will be and mark it. Then place your lock in line with your vent, jockying it around so you can pass your fron lock bolt thru you 3/16" web. Trace around your lock once you have it positioned correctly.
Then position your trigger where it needs to go and trace around it. At this point you can measure back from your trigger to establish your trigger reach distance and mark it.
Now you can put your buttplate on the mark. You'll have to figure out how much drop you'll want at the heel and nose of the comb. Mark these measurements and place the buttplate so the top of the plate is in line with the top of the comb and trace around the butt plate. Now youcan establish to toe line up thru the wrist area. I then cut this pattern out and lay it on my stock blank and transfer the patten to the blank.
This process isn't always a snap. I will at times spend several hours trying to get all these demensions to line up properly and look right.
Each set of barts will require a different pattern. Factory printed "blue print" styled plans aren't going to do you any good unless you're using EXACTLY the same parts as the plans.
Any questions, feel free to ask.