Stretching your plywood...just 1 technique

[MickinOz]

I've fiddled with the photo in MS paint to show the approximate glue line.
The glued panel is 6 inches wide (~150mm)
I laid it over the edge of the bench this morning and couldn't flex the joint putting my (not inconsiderable ) upper body weight into it.
Since there has been no commentary saying this is a really bad technique, I think this is how my 17mm (11/16) wall panels will be extended.

[twisted lines]

Looks good Mick
I searched a little after you did your's, and found this and may try this self aligning trick next time

[MickinOz]

Good Lawd. How the heck do they cut that?

[twisted lines]

Good Lawd. How the heck do they cut that?

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