Koa rails and stiles are tongue-and-grooved for positive registration then secured with multiple 3/8"x 6" steel bolts through the stiles into steel pins set into the rails. The resulting joints are exceptionally strong, yet they may be adjusted for wood movement or taken completely apart for repairs to the glass or other door sections.
The hardwood panel sections are attached to a backing of 1/4" marine-grade plywood. The two complete front and back panels are then sandwiched together and float in grooves in the frame. All hardwood pieces are shiplapped to allow for wood expansion and contraction without exposing the plywood cores.
The mortise lock and handle set with short cylinders provides a full security lock and deadbolt without the usual excessive lock hardware interfering with the door's visual design. The hand-turned koa wood knobs are supported at the frame by sintered bronze bushings for strength and smooth, rattle-free operation.