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 account is required to use the builder, though signing in lets you save your progress. 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.