Best way of implementing a GUI

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Hey everyone,

I've spent the better part of last week trying something with no success, so I've figured I'd ask the experts:

Currently I'm working with a roof-mounted laser scanner. I've managed to extract all the relevant moving objects (non-wall and non-ground) and assign them to individual clusters.

After that I wrote a function which tells me whether or not two clusters are TOO close or not. Now what I'm trying to do is create my own "GUI", which on the on hand incorporates what I'm seeing in RVIZ right now ( all the markers, the pointcloud, etc)

but also some sort off Button that lights up green or red, depending on whether two objects are in fact too close to each other or not. It's a simple introduction to a more complex problem I'm tackling.

Now my question is, is there a way to do it with rqt_gui, or would it be more feasible to do so in with qtcreator? I'm struggling to find the right approach. Rqt_gui has an nice way of implementing rviz, but I can't figure out how to add my "custom" plugin ( the light-button).

Thanks in advance!