Modular Magnetic Paint Holder

Hey guys. Friend of mine asked me to design holder with magnetic head with various sizes for miniature painting. He have sent to me the sketch and I have than designed 2 types of them and 2 tipes (each 3 sizes) magnetic heads. Package consist of:2x magnetic holder3x magnetic head ver1 (30mm, 40mm, 50mm)3x magnetic head ver 2 (30mm, 40mm, 50mm) What do you need to assemble one stand?3x 10x1mm magnet1x 10x1mm magnet for each additional head