Ok this is how I've installed mine. The panel is the standard alias to \P-3C_ORION_FSX\Panel.The general-purpose virtual cockpit for the P-3 series
and the sound is aliased to P-3C_ORION_FSX\sound.
The aircraft.cfg is Aircraft - p3dv4.cfg renamed.
At the moment I can't work out what the extra model folder in the cp-140_ab_kbt_V1_1 download is supposed to do and so I've deleted it.
By the way the folding stairs are working for me.
Thanks for the help
Mike