12-string open headstock question

[viento]

I´m a bit insecure about the 12-string open headstock I intend to build.
Would a cedro wood panel for the neck and headstock ( 20mm thick 25/32 ″) be sufficient or too week?

And will 7mm or 09/32" of diameter for both of the outside bars be strong enough?
I marked this in the photo beneath. See the red arrows.
The inner bar is from 15mm (- 19/32") on top to 22mm -(55/64")down near the nut.

[arie]

FWIW, I would go with Mahogany but if using Cedro I'd re-enforce with CF and a single truss rod.

Consider putting the truss rod access in the soundhole. Step up to 8MM for your side ribs. Consider a volute or at lease a decent handstop on the back. One piece neck if possible. I usually go with 19MM headstock thickness. Don't drill your tuner mount screw holes through the ribs. Have seen a few people do this with bad outcomes.

[viento]

Originally Posted by arie

FWIW, I would go with Mahogany but if using Cedro I'd re-enforce with CF and a single truss rod.

Consider putting the truss rod access in the soundhole. Step up to 8MM for your side ribs. Consider a volute or at lease a decent handstop on the back. One piece neck if possible. I usually go with 19MM headstock thickness. Don't drill your tuner mount screw holes through the ribs. Have seen a few people do this with bad outcomes.

Thanks for posting your opinion!
What you suggest is what I was thinking too:

The single truss rod acces in the soundhole.
Headstock thickness will have to be a tad more than the metal tuner-base which is 18MM wide.
And I guess the side ribs are more reliable with 8MM.
As for the handstop on the back, I love one to be there with a light curve from the neck up to the head.
I will keep the tuner mount screw holes as short as possible.
And I will use the cedro wood I have already lying on my work bench.
The luthier who sent me the cedro told me that this wood is somewhat softer than Mahogany but has longer fibers.