Realistically, I think you are asking too much from available
hardware. A rotax tri-gear Europa has a range of about 300 nm with
the factory tank at reasonable cruise. There is no standard
long range tank for trigears or taildraggers, only available for
monowheels. That extended tank only added about 50% to the
range.
Expecting 150kts on 3gph also seems a bit optimistic too. I get
about 135 kts at 5000' at 5.5 gph with 912S. In the 912S fuel
consumption increases with altitude.
If you want a parachute for the fuselage, you will need to design that
yourself since it has not been done before.
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Ira N224XS
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