Setting up a project

["Joel C. Salomon" <joelcsalomon@gmail.com>]

I'm trying a fairly ambitious project to teach myself practical
ConTeXt -- typesetting a book I'm writing.  As per
<http://wiki.contextgarden.net/Project_structure>, I've created files
for the project, environment, product, and component.  The component
file (preface.tex) is the only one with (dummy) content right now.

Side questions:
Does a project with a single product really require the full hierarchy?
Is there a dummy layout I can put into the environment file to test the set-up?

Now I want to set up the layout.  An example of what I'm trying to
achieve is at <http://typophile.com/files/Layout.pdf>, currently done
in OpenOffice.  I'm not yet asking about fonts; I just want to put the
text in the correct places.  It doesn't seem that 6×9 (inches) is a
built-in size, so my environment file (env_firefly.tex) needs to look
something like:

\startenvironment env_firefly
\definepapersize[sixbynine][
	width=6in,height=9in,
	offset=???,scale=???]
\setuppapersize[sixbynine][sixbynine]
\setuplayout[...
	...]
\stopenvironment

Do I need to define & name the paper size, or is putting it in the
\setuplayout sufficient?
What are the "offset" & "scale" in the paper size?

I want to have 6″×9″ trim, inner margin of 48pt, outer margin 96pt,
top margin 72pt, bottom margin 144pt for starters.  Headers and
footers, when they exist, are allocated 12 points height and are 12pt
away from the text. (See the linked-to example.)

I have read several of the manuals, I'm just having trouble putting it
all together.  Also, I'm not looking for a recipe but guides on
developing the layout myself so I can understand it.

Thanks,
--Joel
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