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I have a ways to go, but here is an update on my progress.
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It was a humbling experience while searching for references for the stretcher. It seems as though every wooden surface from the middle ages had something carved on it. The apparent speed and skill of the craftsmen is mind boggling.
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For the relief carving, take my process with a grain of salt. I'm figuring this out as I go along, so if you really want to learn relief carving, you might want to invest in some good books or DVDs from folks who've had training.
Basically, I draw the design, make stop cuts straight down along the outline, use shallow gouges to pare away and level the background, then start on the design.
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To do that, I also outline the pencil lines with stop cuts, and then carve away portions that should appear to be further away in perspective. I start with basic shapes and then work back in with finer details. No sense getting too detailed in case you find you need to make certain areas lower as you go along.
Onward....