draw a 6 x 24 box, draw a 5.5 x 23.5 box, draw a 5 x 23 box, center them all, add the street name in the center of that & cut. Weed out between the letters and the inner box, & between the outer 2 boxes. You will have a 1/4" border that will fit 1/4" inside of the aluminum blank.
(I worked at...