This is verbatim from Missouri's regulation. Every state has a similar requirement:
The registration numbers shall read from left to right, and shall be in block characters of good proportions, not less than 3 inches in height.
Though the numbers have good form, they are not of sufficient stroke, and the capital letters will not be satisfactory.
The skill of being a signmaker is in finding a font with similar character that meets the legal requirements. You need to find a similar brush letter that is a "print" style rather than script style, and done with a thicker stroke.