How would you effectively brace the upper bout on this acoustic bass guitar ?

[freddi]

it needs a strong upper bout brace - then neck angle trimmed to establish a playable string action.

Sorry I don't have any pix inside as the bass is away at my house.

 

[Osvaldo de Banfield]

An exponential cut like Karlson speaker, call my attention.

 

[freddi]

Karlson's 1951 Acoustic Transducers Patent

 

[seventenths]

Falcate bracing instead of traditional x bracing maybe?

https://lutherieacademy.com/courses/falcate-bracing

 

[seventenths]

There's a nice writeup on mimf.com on the style

 

[jjasniew]

Like this? The situation is a toughie!

 

[Printer2]

What a stupid design. What keeps the neck block from rotating?