One thing you can get started on is your bottom metal template. I used some 3/16 aluminum plate 9" X10". 10X10 is better in retrospect, for a better surface for the router to ride on. 1/8 inch worked but 1/4" is better. It's what I had lying around. Here's what it looks like, finished.
This takes about an hour and a half. Here's how I did it:
I cut a 10" by 9 1/2 inch piece of aluminum plate.
I sharpened an ice pick and used it to etch a fine line down the center of my plate with a straight edge.
I measured the centers of my action screws and etched them across my center line. (Notice the top of the template. You want to have the trigger guard end of your bottom metal about a 1/4" from the edge of the plate because it needs to snug up close to your grip.)
I then etched the outside edge of my bottom metal onto the plate. It's a little tricky because you have to remove some of the aluminum to get the bottom metal to sit flat on the plate. Leave the portion of the plate with your center marks until you have the bottom metal completely etched on the plate. Use the marks to site thru the holes in your bottom metal to keep it centered. You could also drill holes and use bolts to keep you centered.
Then, I drilled a hole near the edge of my cutout so I could use a jigsaw with a fine metal blade to cut close to my etched line. Readers and a good work light help.
Use some various flat and round files to fine tune the opening until your bottom metal can "just" slip thru. File square to the surface.
A slightly loose fit is OK if you file a little too much. When it's installed in the stock, you'll need a flashlight to see any gaps. If you're changing the stock design for an exposed magazine or flush, factory bottom metal you should take the extra time to make your template tight to your bottom metal.
The last step is to back your template up with 3/4 inch ply. I cut this piece 13" wide by 10". Center your aluminum template on the ply, drill and chamfer at least 4 holes and screw your template to the ply. Make sure your screws are flush or below flush so your router doesn't catch on them.
Drill a hole thru the ply and use a jigsaw to remove "most" of the wood in your cut out. Some jigsaws cut at a slight angle, especially in curves, so stay at least 1/4 inch away from the aluminum. Use a "flush cut" router bit in your router to remove that last 1/4 inch. Slow and careful so you have a smooth cut because your bearing is going to "ride" on that surface as you route deeper into your blank.
Use a square and a really sharp pencil to mark your center lines on the inside face of the plywood and you are done! Good job!
I traced the inside lines of all the templates I've made onto the pattern print I'm sending you to speed up your process.
These include:
PT&G AICS mag for Remington 700 and clones
Tikka 595
Tikka T3
Tikka CTR
If you don't have one, the small "laminate trimmer" router is helpful for this procedure. Add that to the tool list.
