Robi - start working on cool fonts for the letter and numbers to match their graphics......
I bet the law states they have to be on the bow (not boom or beam) and readable from some distance. .
Here is what Florida's current statute 328.48(4) says about location and style for hull numbers
The numbers shall be placed on each side of the forward half of the vessel in such position as to provide clear legibility for identification... The numbers awarded to the vessel shall read from left to right and shall be in block characters of good proportion not less than 3 inches in height. The numbers shall be of a solid color which will contrast with the color of the background and shall be so maintained as to be clearly visible and legible; i.e., dark numbers on a light background or light numbers on a dark background. 
