Tom7
I'm so bright, my mom called me son! ;-)
That's wild about the crutch and the bungees. I'm gonna have to do that, if for no other reason than to say I've done it.I'd say Hotwire succeeded.
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Great thread. A big +1 from me regarding the comments about the actual look being important - I'd say more important than the sound, really. In that light, if Barker had something like a scroll headstock I'd consider one. One local blues guy just affixes his Jazz bass via bungee cords to a modified crutch and uses that as his "upright".
I say this because I am also in agreement with the comments about playing upright-like lines if you want it to sound like an upright. IMO, it's the lines and the music they're part of that makes it sound like an upright as much as anything else. Palm muting goes a long way too, especially on a fretless with flats EQ'd correctly, IME.
Those Rob Allens sound great, but it'd be nice if they just came in black. The fancy woods aren't my thing visually, and getting back to the image thing I think basic black, brown, or even sunburst would sit much better in the visual mix if trying to substitute for an upright.
It'd be nice if MF Luthierie had prices on their site. Anyone know offhand what those go for? Some awesome-looking basses on that site.

I hadn't heard of Hotwire double basses before, thanks for the links. Interesting. [Invalid or Expired Link Removed], nice enough to get me thinking "can they make a 6 string?" These would be more flexible than Rob Allen I would think. FYI, I found [Invalid or Expired Link Removed]. The 5-string goes for 2,445, which is $3,870.44 at the current exchange rate. That's probably a "list" price that you can get marked down, but then again you've got to pay to have it shipped.
I've written MF Lutherie for a price quote for an acoustic 6, 5 and 4 string like Alain Caron has. I'll let you know what they say.
EDIT: So I can find it again, here is a YouTube vid of Alain Caron soloing on an acoustic, presumably the MF Lutherie.