Building on trust. Custom Metal Works take on commercial projects and residential projects in decking and steelwork. Creating beautiful, natural spaces in your home and environment. Peter-John d’Aguiar founded Custom Metal Works in 2015. Peter-John is a perfectionist in his work and has over ten years of experience working with steel work and decking. We operate throughout the Western Cape region, commercially and residentially. Custom Metal Works manufacture and install the steelwork and decking.