Sounds good and the splatter effect might just work and you can find cheap acrylic stuff in Officeworks, Spotlight or any craft supplies store.
Again, as always, test on scrap before attacking the project guitar and also apply some clear top coat to see if it reacts with stuff used for splatter effect. If no reaction you should be good to go as I presume your spray cans are acrylic anyway?
EDIT: Just saw your mock build and love it just as it is. I reckon run with the minimalist approach here where less is more on this one.