For an electric sign... all of your copy is too dainty. You need to beef up the letters or they'll be lost at night.
On another note.... are you installing this ?? Or just supplying the box and decorated face ??
According to where it's going, it probably has to be U/L stamped. Then installed by a licensed electrician.... or at least hooked in by one.
Things to consider before you purchase the wrong box or kit.
If you do it by the book, I have some suggestions for your box.... you're not far from us.