While you're in "while I'm doing this I may as well do that..." mode,
consider what you'll do when you take out the old interior sidewalls.
If they are as crummy as mine, you may want to scrape off the old
glue (carefully!) and insulation (which is probably in flakes by now)
and install new sidewall insulation in addition to the Airtex panels.
One option is the 1/4 in foam (with or without foil on one side, your
choice) that has glue already on one side. Fit it carefully around
the wiring and such on the pilot's side...Oh, and this may also
be a great opportunity to check that wiring (avionics and such) and
replace really old wiring...

It never stops...