A couple more thoughts to add to the above. If I was building that I would approach finish as follows
- pore fill the ash body before gluing the top insert in place, I might even wait to route the channel that it sits in.
- I might consider putting a thin black plasitic purfling line between the top and the body. The would define the end of the black stained area, would keep stain from migrating into the ash and would give a nice line to scrape to
- Brush two coats of sealer on the ash up to the seam with the top, use an artist's brush. I would use vinyl sealer because I finish with lacquer, shellac would also work. Mask over the top of the sealer with pin stripe tape just to be extra sure.
- Apply the stain. When you are happy seal it. As you probably know, stains are tricky. My cardinal rule is always to practice on scraps of the same wood and practice all the steps.
- Pull the mask, scrape the sealer off with a box cutter blade. Go right up to the seam, if you installed the black purfling scrape that with the point of the blade.
- If you didn't pore fill before you could do it now. Seal the entire guitar, shoot the finish as usual.
Good luck, it should be stunning
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