I ordered DIN A2 bookbinder's cardboard and the spine doesn't fit - even laying diagonal by some millimeters.
So I cut the spine into two and placed her on top the 1mm cardboard:

I could not go to bed this night before the very first layer was cut out. The next layer is cut near bulkhead four - and so the laminated spine-parts do fit together giving a stiff 5mm thick centerboard. Being glued together, than the slots for the bulkheads will be added by the use of my trusted Proxxon table saw.
So this night I worked it out this way:

So I cut the spine into two and placed her on top the 1mm cardboard:

I could not go to bed this night before the very first layer was cut out. The next layer is cut near bulkhead four - and so the laminated spine-parts do fit together giving a stiff 5mm thick centerboard. Being glued together, than the slots for the bulkheads will be added by the use of my trusted Proxxon table saw.
So this night I worked it out this way:

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