17 recipes · 17 tiers · 12 gathered materials
Everything the hideout needs to make Mattress, read left to right: the goal is on the left, the things you gather are on the far right, and every dashed box between them is one bench recipe. 19 recipes left out: each needs something already further along the chain, so it is not a way of making this. 10 links cut where two base materials convert into each other — a loop is not a step toward anything.
Gathered materials 12
Craft graph
Multitool gather ×2
Purple Minerals gather ×5
Saltweed Pulp gather ×8
Plastic Bottle craft ×5
Asbestos gather 
Gas Cylinder craft 
Dark Limbo gather 
Bottle of Pure Water craft ×3
Fabric gather ×5
Frying Pan gather 
Gypsum craft 
Remains of Murmur Devices gather 
Huge Artifact Fragment gather 
Strange Artifact gather 
Potash craft ×2
Saucepan gather 
Pack of Bolts craft 
Strong Boar's Hoof gather ×5
Ethylene craft 3
2
2
1
Electric Mixture craft ×2
Thermal Mixture craft ×10
Polymers craft 3
3
3
3
Protective Gear craft 
Gloves craft 4
4
Caustic Sodium craft 
Sulfuric Acid craft ×4 3
Aluminum Powder craft ×5 3
Reagents craft ×5 2
2
2
Iron craft 2
Sewing Kit craft 2
Mattress goal