Here is a basic rundown for the different things that you have inquired about...
CDI does good, quick work on the DBM inletting for the B&C stocks. Just depending on which inlet you actually choose. He can inlet the stock for use with his DBM, or a different one. You will need to decide which bottom metal you prefer.
AI type bottom metal vs. Savage bottom metal...
Here is where it gets tricky. All of the AI type bottom metals are pricey, and the AI type magazines that go with them are pricey. They are tried and true methods of obtaining the DBM setup you are after, and there are ALOT of people that run them. I used too as well.
My preference is the factory Savage bottom metal. I prefer this route for several reasons. 1st, COST!! The factory setups can be had fairly inexpensively. That is based on the cost of the bottom metal, inletting, and magazines, including high capacity ones.
I also prefer the factory Savage magazines due to being able to top load the magazines, as well as being able to load rounds into the magazine while it is still inserted into the stock. And yes, they can still be loaded 1 round at a time in single shot fashion. Also, I prefer the Savage magazine release button in the front, as oppposed to the rear release tab. I can fully control the Savage setup easily by grasping the full magazine, and still easily release the magazine with my index finger. With the rear release tab, while you can do it while grasping the magazine with your fore fingers and releasing the magazine with your thumb, I have more control with the Savage.
To address your other question concerning the utilization of the M1A or other magazines that hold 20 rounds. The biggest problem here is, getting the proper orientation of the magazine feed lips in relation to the receiver for the bolt to pick up the rounds. Yes, it can be done, but there just hasn't been enough interest in the shooting communities to go this route. The AI magazines are basically the "flagship" style of magazine, and therefore the largest customer base to appeal too.
DK
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