Paul,
  I was out at the airport today and got the firewall measurements you
  asked
  for.  I added station 19 because this is where the outer edge of the
  tunnel
  is located (Your drawing shows this as station 18.)

  Referring to your drawing, the dims are as follows:
    0 - 1/4"
    3 - 0"
    6 - 1/4"
    9 - .7"
  12 - 1.4"
  15 - 2.55"
  18 - 4.8"
  19 - 5.8"

  A 5" radius would be about right for the tunnels.

  The measurement on the front motor mounts is the outside-to-outside
  dimension and is 20 1/8", best I can measure.

  Thanks,
  Mark

  You lost me there Mark. Is this the dwg you are referring to?
  If not send me the dwg.

  Paul Lamar

  Paul,
  I can't locate the drawing you sent, but the "0" point was at the upper
  right motor mount point and it went down the side in 3" increments.  The
  19"
  point is at the outer lip of the exhaust tunnel.

  Mark

  Do you have MS Paint?

  Paul Lamar



 Paul,

 I think I have the drawing you did of my firewall on my home PC.  I'll
 check
 tonight.

 Mark

Paul,
Here's the marked up drawing of the Lancair ES firewall with dimensions.

Headed to the airport,
Mark S.

Here is the Dolly Parton version.

Paul Lamar