I think his (assuming male, sorry if not) inspiration might've been taken from VV Orionis, because of the 'VV' that's undeniably there in the spectrogram on the right hand side.I'm astonished by the result, the legs, arm and bow line up practically perfect.
If I weren't on vacation right now I would race towards Rigel, Saiph and Bellatrix right now.
This image is what makes to most sense to me so far from all theories brought up here.
With this image the signal functions as a key opening a map.
I dunno how you came up with this brilliant idea but if it turns out to be what we're looking for then you're just that, brilliant!
Cheers fellow countryman.
Some fun RL facts about what is believed to be 'in there': two B class stars orbiting around 15% Mercury's distance from each other - an eclipsing binary - along with an extra A class star about 1 AU away. (taken from http://stars.astro.illinois.edu/sow/vvori.html)
And we can't currently get in there.