The winner of the black fixed 6-string bridge is José Paulo Brito, who correctly matched the tremolo spring blocks to the sound samples! Here is José’s plan for using it:

At this moment, the only headless project I’m considering for using a fixed bridge, is a 30″ baritone guitar.

Due to the heavy gauge of the strings this guitar gonna have, using a tremolo is not much wise, also because such tremolo action would result too stiff anyway.
I already have two Bartolini soapbars (P90 dims) for it, also a Headless Research combo headpiece.

No body or neck until now but it will be something ergo-shaped somewhere between a Steinberger/Klein although having my own contour of course.

I hope to be able to post a picture of the winning contribution in action soon.

Thanks again to those who entered, and especially the runner-up Roman.