I beg the differs, 
You have not considered 5 string route a la John Myung.
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With such a thin neck?
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Look up his Bongo model. It’s a 6 string bass on a 5 string neck width which would make the spacing pretty tight.
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This is right up my alley.
I’ve built a few of this type;
I’ve used several different headless bridge systems, plus I’ve made some of my own as well. There are a few fairly inexpensive choices out there today, I think Guyker offers the most choices, though I really like the headless bridge on the build that @Al1885 posted. That’s pretty cool, do you know if it’s available?
(Edit) I found the Riviera web site. This may hurt…
You can also “scoop” out the body around the tuners, to allow for adjustment.
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Napoleonic code - presumed guilty, and you have to prove your innocence
We have a state, Louisiana, that is under Napoleonic code
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It also gave us the metric system, but who uses that? Exactly
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Which works a lot better now that it’s been fixed.
But I was thinking more about marching armies all over the place.
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My absolute favorite ice cream! 
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Well, those armies ain’t just gonna march themselves!
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I like those on top tuners @Al1885 posted.
I would go another route though. Why not see if you can find a cheap short scale neck with the headless locks already on it? That way if you don’t like it you can swap the bridge and neck back out and save the parts for another build.
I dig your idea and if I had more cash I would have done it to my Frankien -bronco
Which I need to work on soon!
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Cool!
The “scooping” does not worry me. I have my punky-funky luthier for that.
Putting .125 E-strings through the locking nut might be?! Do you know the Guyker solution?
Also, I can’t remember if flats will work when cut. Either round core or hex core is supposed to be sh#t for headless!?!?!?!
Yeah - but the Guyker set is 40€ 
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Basically, everyone except the U.S. and the U.K. Also, as far as I know, I19 that runs between Tucson and Nogales is the only stretch of highway in the U.S. that’s metric.
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I do agree with @barney.
Also, if education is based on pre-Darwinian ideas, an imperial system fits the general attitude better
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Oh the UK just likes to use a different system for every measurement you can think of, just to make things difficult.
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Sarcasm
Also fun fact - Liberia and Myanmar still officially use the imperial system.
Metric is great. Canada while officially metric, mixes some systems.
Lumber in feet, 16oz/20oz beers in the bars etc
I’m currently making custom door jambs from scratch for a new house.
The mortise machine I’m using is Spanish so all the readings / controls are metric (mm)
The door hardware (hinges / lock sets) are American, so all the drawings are in inches. Good times.
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Love your power tools
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Remember when the Mars Climate Orbiter burned up and broke into pieces because of a measurement system translation (or lack thereof) error? I don’t envy you having to work with both at the same time.
When NASA Lost a Spacecraft Due to a Metric Math Mistake
In September of 1999, after almost 10 months of travel to Mars, the Mars Climate Orbiter burned and broke into pieces. On a day when NASA engineers were expecting to celebrate, the ground reality turned out to be completely different, all because someone failed to use the right units, i.e., the metric units!
The Mars Climate Orbiter, built at a cost of $125 million, was a 638-kilogram robotic space probe launched by NASA on December 11, 1998, to study the Martian climate, Martian atmosphere, and surface changes. In addition, its function was to act as the communications relay in the Mars Surveyor ’98 program for the Mars Polar Lander. The navigation team at the Jet Propulsion Laboratory (JPL) used the metric system of millimeters and meters in its calculations, while Lockheed Martin Astronautics in Denver, Colorado, which designed and built the spacecraft, provided crucial acceleration data in the English system of inches, feet, and pounds. JPL engineers did not take into consideration that the units had been converted, i.e., the acceleration readings measured in English units of pound-seconds^2 for a metric measure of force called newton-seconds^2. In a sense, the spacecraft was lost in translation.
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I have TI jazz flats (round core) on my Ibanez headless and they are cut off about 5mm from the clamps and a year later there is not the slightest sign of them unwinding or anything else amiss.
If you look at how they determined the measurements during the revolution, it was kind of unscientific. Like the meter was based on two guys measuring with a ruler as they walked across France, one of them through the French Alps, so it wasn’t very exact. And then a liter was a cubic decimeter, and the kilo is the weight of a cubic decimeter. Of course a cubic decimeter’s weight will vary on temperature and humidity.
All of which has been addressed in modern times. But the metric system of the revolution was as flawed as the imperial system it replaced.
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What’s great is of course the well defined relationship between metrics … and the use of a decimal system!
I mean, come on: 1/32 inch? What’s that?