Resynth: Creating Sample Start, Loop Start and Loop Length position markers

Hello all!

First time posting on the forum, I am a novice at building in Reaktor but learning from a friend I am taking lessons with. I am running Reaktor 6 on a Mac.

For an assignment he gave me I want to using the Grain Resynth sampler module and design an interface that allows the user to control the Sample Start, Loop Start and Loop Length directly on the samplers waveform with the mouse. I imagine this can be achieved by layering different Mouse Areas over the waveform but I am struggling to create a kind of marker (vertical line) on the waveform to represent the respective parameter position, would be especially cool if I could have a highlighted region between Loop Start and Loop Length to model the loop duration.

Thanks!