I think it's fantastic. You used the Moomba Masque font and from a distance it's going to look just as good as domed lettering.

I did a similar thing and had my registration #'s done with the Moomba Masque font using flat vinyl. Mine is done in silver metalflake on the blue gelcoat:



So your next logical step would be to do your registration #'s in the same vinyl/font to match your MOOMBA.

That's a dramatic improvement in looks (Tribal = Bye Felicia) and props for doing it without costing a ridiculous amount!