I’m just curious - what’s the appeal of such a lightweight guitar body?
There is plenty of material that can be removed from that body without a cavity. You can extend the contour of the bevels and also add one near the upper horn to make the body thinner. You just have to watch thickness near the control cavity routing. As long as you don’t make it thinner between the neck pocket and wherever the strings mount, it should be fine structurally.
My most favorite guitar was neck heavy. I loved everything else about that guitar - the sound, the playability, the look, etc. But eventually I just couldn’t take the neck diving and sold it, and I don’t even regret it.
Some options to deal with a neck heavy guitar are: a) ultra-lightweight tuners ($125 usd) to save ~100 grams (this is based on guitar but they make them for bass, and I think the weight is similar because bass tuning machines are heavier), b) adding weight to the guitar body, c) using a harness instead of strap, d) using a grippy strap but ends up pulling your shirt all over the place, e) moving the strap buttons to awkward looking positions (probably the most effective and sensible solution, but also the strangest looking), f) attaching strap to neck instead of button, g) only playing sitting down, f) for just not giving an f.