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Mike -
  I intended to measure the panel-to-header tank distance in my Lancair
last evening, but forgot. I will do it this evening!
One thing to check and pre-plan...with the canopy closed, it's forward
sloping area will interfere with the top instrument in your stack and thus
it limits the depth of the top instrument. That is why I chose and placed
the Garmin 150XL at the top. It's only about 6-3/4" deep and you'll have
only 8"-9" available for the top instrument because of canopy interference.   My stack top-to-bottom, consists of a Garmin 150XL, Icom A-200
Transceiver, Narco Transponder and VMS. Had they been available at the time,
I would have chosen the Garmin 250XL (150XL with built-in transceiver) and
Garmin Transponder, thus leaving room for the VMS alarm above the display
itself. Of course, if you have the $$$, there are some much more exotic and
compact full IFR units now available (i.e. Garmin GNC 430).
  For rear support of instruments, use a shear to cut two, 1-1/2" wide
strips of .10 aluminum (length to suit) and fasten to each side of the
instrument trays. Fasten the support strips themselves to the nose gear
tunnel with two 3-16" aluminum pop rivets (backed up with area washers). One
side will not line up exactly with the side of the tunnel ...simply bend
slightly.
            Bill Rumburg
            N403WR  (Sonic bOOm)

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