If Slicer 5 won't install, use (by TIG) or Flattery (by Chris Fullmer). Both are free on Extension Warehouse.
Historically, slicing tools in the SketchUp ecosystem have evolved. The original "Slicer" plugins were often free, open-source scripts developed by community legends like TIG or Whaat. However, as SketchUp evolved into the Extension Warehouse ecosystem, many of these tools became paid or were absorbed into larger plugin suites. Slicer 5 Sketchup Plugin Free Download LINK
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It can create "egg-crate" intersections so the pieces can slide into one another. If Slicer 5 won't install, use (by TIG)