That's interesting, as being loud enough to play like that is all I'd need it for, just as long as it's loud enough to be clearly picked up by a microphone.
Having checked out videos of the Carvin AC375, that's quite loud give that it's quite thin and is pretty much a hollowed out solid piece of wood.
The main issue I have is that I want to make it headless, and finding information on headless acoustics isn't easy! I've read something say they don't work, but what I read didn't go in to detail as to why it didn't work, so I'm thinking if what they've said is true, it might be based on a specific implementation of a headless design.
Fortunately, I don't do singing either anyway.
I just need it thin enough to be comfortable, as I find acoustics awkward to play due to their thickness, something in between an electric and an acoustic in terms of physical size would be perfect.
My Agile guitar (the neck through one with mahogany wings) is actually really quite loud unplugged, considering it's a completely solid guitar, it just sounds thin on the lower strings due to the lack of reverberation from a chamber/sound hole.