Mounted Plate Rack

Taken all the way down to base materials, one Mounted Plate Rack is 3 crafting steps deep and needs 4 intermediates — Cobalt Ingot ×4, Mahogany Lumber ×3, Mythril Rivets ×3 and 1 other — which resolve to 4 distinct raw materials totalling 30 units, plus 72 crystals.

That bill outweighs 10,368 of the 13,602 recipes tracked here and 1,066 of the 1,552 Carpenter ones, and 337 recipes nest deeper.

Only 10 of those crystals go into the final step; the other 62 are burned by the intermediates, so the real crystal cost is 47 Fire Shard, 20 Wind Shard and 5 Ice Shard.

The chain crosses two disciplines — Carpenter to Lv 43 and Blacksmith to Lv 42 — so no single class can finish it unaided.

All 4 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Of the intermediates, Cobalt Ingot has the widest use: 145 recipes call for it, spanning seven of the eight crafting classes.