Quoted from vid1900:
You don't have to put aftermarket braces on the cabs.
James installs them before routing and the joints still telegraph through the decals, so he says they don't make any difference in commercial use.
I've repaired so many hundreds of Williams cab joints back in the day, that I could never count them. Bracket or no bracket, joints split if they want to.
If there is one thing Pinside has proven again and again, it's that Pinsiders have no idea what quality plywood is. Absolutely none.
The more layers in a sheet of plywood, the more expensive it is (generally speaking, I know some Pindick® will find a 200 layer sheet for 3 Rupees and start wildly beating his meat ).
Here is a cheap piece of plywood.
Very few layers (5 layers), voids between the plys, and no MDO faces to make it smooth and hide the grain:
Williams used this type of plywood until the 90s.
Just for the Pindicks®, here is a cheap piece of plywood with many layers, but you can see that the layers are not straight, tons of voids, just anything they could smash together, and no MDO face:
You don't see this stuff too often in the States, but I know someone would say "LOOK!!!! Here is 13 layer plywood from India, solid, mega lumber core, supreme! "
Finally, let's look a piece of quality plywood.
All the layers are straight.
The MDO face is a super smooth layer of MDF that comes pre-primed and sealed from the factory. This layer prevents the grain of the wood from telegraphing through the paint or decals.
If you need to paint a plywood product, MDO Ply is the ultimate. Williams started using this in 1992.