I want to use the mirror page layout to  indent the text body a couple of
inches from the left and right edges of alternating pages of a report.  ( I
can make this work.)   The problem is that I want a full width header accross
the page (say 7 inches on the top of an 8 inch page) with different margins
than the narrower mirrored text in the body of the report.  When I use the
mirror page set up, it changes my header and extends the border line located
in the header (line from from margin to margin for decoration) in the header
only the width of the text margins.

I aslo do not want to have to create sections breaks on each page of the
document to make this work.

Any suggestions?