Cloned the Trailblazer.
Have parts bagged to clone the standard ARM and 2X2.
Unique aspect of the Concept II were the motors: Tracker motor produced dense smoke. FX motors produced smoke and little thrust for billowing clouds prior to launch.
Special ignition system would light the smaller FX outboard motors first. A few seonds later the main motor would light.
Interchangeable mounts: 24mm, 18mm, 18mm w/FX motors.
MRC Tracker and FX motors come up occasionally on EBay.
Haven't tried them.
Don't know if I want to.

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I like the unusual, the off beat, the avant-garde. No 3/4 FNC for me!