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Matt and Jessica continue the construction of their 42-foot catamaran by installing structural webbing forward of bulkhead four and bulkhead five.9:26 These transverse and longitudinal webs create a series of individual, watertight cells that serve as a secondary hull bottom, providing buoyancy redundancy in the event of a puncture.1:48 The builders reject filling these compartments with closed-cell foam, citing unnecessary weight, potential waterlogging, and the inherent buoyancy provided by the cellular structure itself.2:18 They also avoid running plumbing or electrical conduit through these bulkheads to prevent potential leak points, opting instead to route all systems inboard above the waterline.3:47 The construction process involves trimming CNC-cut panels with a circular saw, scuff-sanding bonding surfaces, creating coves with thickened vinyl ester resin, and laminating the joints with 12-ounce double-bias fiberglass.13:36 Tools are maintained between sessions by soaking rollers in Total Boat EcoSolvent.14:19

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