Yes, this lightsaber was based on the lightsaber accessory that came with the acton figure. At that time, the prequels had not yet established a design or shown Plo Koon with a lightsaber so they created a design so not canon. One of the images of the lightsaber you posted is from the Force File document that came with the figure.
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More info about the figure and the Force File here:
Rebelscum.com: Photo Archive
At the time (year 2000), we here at RPF were pretty starved for new lightsaber hilt designs so we tended to go crazy at anything new. We also did things called active projects in which various members gave input into designs and ideas. Members were encouraged to construct their own replicas based on specifications devised and also others like Luuke who could offer built replicas for those who were not so much into DIY.
Here are the finalized designs that the group ended up with. Maybe you can build your own.
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At the time, I was lucky enough to have someone who had access to a metal lathe and the made on for me. I used an extra Obi/Qui anodized red button, extra T-track, and some other scraps to finish the look.
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