Cardboard-Laminate Panel (DIY OSB)

Niche Fill — Free-form custom household shape, no table saw or lumber needed

Best shape: Any shape scissors can cut · Tier: Household / kid-project

Novelty/infill only, not a sheathing or structural substitute

Cross-oriented cardboard layers + wheat paste binder, mandatory watertight skin (rot is the failure mode without it)

Verify: zero compression/load data exists anywhere — lower ceiling than aircrete