If you're adding artwork, plexi, and t-mold, there's no need to prime or paint the top.
How's the box (or whatever you are fitting the cp top to) look? If bare wood, then
prime and paint is good. You could use laminate instead - might be a bit more
in cost, but slightly less work (imho) and can look better than some paint jobs.
(depends on how much work you do with the paint job).
btw, your avatar is a png, not a gif - and wasn't that Frizzle's avatar at one time?