Paul,
      Origional mount on the glastar sportsman is a 5 hole mount.

    distance between botom two holes  31  1/4 inches
   Distance between two upper holes   36  3/4 inches
   Distance between botom holes and upper holes vertically  21  3/4 inches
   Distance between the top outer holes and top central hole   20  1/2
inches

existing distance from firewall and prop flange is   35 inches, but this is
an Eggenfellner subaru 6 cylinder motor and quite heavy I believe. I would
expect that a rotary would have to be mounted further forward for the C of
G.

Thrust line as near as I can see is 3 inches below the upper outside holes.

I am hoping to use the top central mount hole for the back mount on the
motor.  Currently it does nothing.

Neil Unger.

Neil,

How far above the top firewall hard points is the top center firewall
hard point? I don't think it is 20.5 inches.

About the shortest practical firewall to prop flange is 37 inches.
The CG of the rotary is about 16 inches aft of the prop flange.

What did the soob weigh? The rotary with gear box, starter, prop,
alternator, intake muffler etc etc weighs about 300 pounds.

You can always move the battery to the firewall.

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Here is the preliminary.

Paul Lamar