Assemble Watches is a free Seiko mod builder. Pick an NH35 or NH36 movement, choose a compatible case, dial, hands, bezel, and bracelet, and visualize your complete watch build before buying anything. No sign-up required. Popular suppliers: Namoki Mods (ships worldwide), Lucius Atelier (premium parts). Parts are also sourced from AliExpress for budget builds. The builder is free and available worldwide.