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The spacers are rather 'bendy' when the vertical axis lies across the grain, but stiffer when it is with the grain. Although the spacers are not load-bearing, I think for the remaining cuts I will ensure that they are all vertical.
This build is turning out to be much more complicated and time-consuming than the Phase-IVs. Partly that's a function of getting to grips with the Shopbot, and one false start, but Phase-IVs had very little assembly. These by contrast have orders of magnitude more; and I'm not even close to starting on the cabinet walls yet.