That'll cost a few dollars!
I have no experience with him but every time a high-end, custom paint question comes up, Mark Jenny is mentioned.
Good luck in your search and please post pics when you get it done. That's a nice color combo.
Just my opinion, but I think with a rounded edge, the two tone you want may not work. Where (and how) would you do the transition from the sparkle top to the non-sparkle back and sides without a sharpe edge to define an abrupt end of the top surface?
Yeah, I've talked to two finishers and both said the same thing you do.
I guess I'll need to order a body with proper sharp edge.
Or alternately you can keep the rounded edges and do the entire body in a sparkle finish. It really depends on which is more important to you: the two tone finish or the rounded edges.
IIRC there is/was a forumite with a Stratoid (a nice partscaster I believe) which had a finish somewhat similar to what you're looking for. Well, it wasn't sparkley, but it had a solid finish on top and trans back. It was I think Ice Blue with a natural back (mahogany body I think). I'm sure you may be able to find pics of it if you dig around. Unfortunately I don't recall their username offhand, sorry. But the finish idea/execution was along similar lines.