Extruded Solids Intersect with each other rather than being conjunctional

I am trying a script that can slice any surface and create a printable solid from it. I will be adding holes to each Item of the this data tree.How do you get the solids such that they share a wall rather than intersecting each other. Or is this too much to ask without a solver of some kind?

10’_Boar.gh (147.7 KB)

if you are ok with non-planar walls (resulting from an inward offset of the external surface) something like this might work:

10’_Boar_inno.gh (150.3 KB)

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Hey Inno,

Thanks for that, but I have come to realize that I need the returns(walls) to be planar for the fabrication simplicity. I would really appreciate help towards the same.