step 1 : use CorelDraw make template ( you can draw with size as you want very easy )
step 2 : print the file template with Cutting Plotter (decal)
step 3 : decal pasted on thin knife
remove this section
step 4 : spray paint on the template
step 5 : remove decal and grinding knife
step 6 : cleaning paint and enjoy
step 7 : Good luck to you, and Do not forget sympathy for grammar and vocabulary, because I can not write in English (translated into English by google) .