I wouldn't be happy with that veneer line. It should be straight and it will be visible to some extent. Look at other peoples finished build pictures. That join line is normally filled with glue and unless it is all removed, it won't take a stain. If you darken the top by wiping some turps or white spirit on, you should see how obvious that line is. Because it's a quilt, the join line will be a bit less obvious than with a flame, but for me it's less than ideal. But looking at the PBG pic for the kit, the one in the kit picture also looks to have the veneer join line at a slight angle, so it maybe a standard factory practice for some reason. But I see no reason that they can't fit it centred correctly (apart from lack of skill).

I've just looked at some of the finished guitar pics and some of them do have a slightly angled join line, while one or two look straight. I can't say that the slightly angled ones look that obvious as long as the join line doesn't stand out as your eye is more taken with the quilting detail.

Before you do any more, I'd drop Adam an email with the picture (and maybe one with a wet surface to highlight the line better) and see what he says. He can check a few kits and see if this is standard or not. And if fairly standard, then hopefully he can work on the factory to get them to improve their output.

I've now looked at the pictures of a real LP Red Widow, and I can tell you that the binding isn't red, it's standard binding that's simply been sprayed over with transparent red nitro lacquer. You can tell from the binding on the neck. The sides are the red but on the top of the fretboard, the same bit of binding is white/cream. I would say that the guitar has been stained black to pop the quilt, sanded back slightly, then sprayed with clear red, then a light clear black burst sprayed round the edge. The binding has then been scraped clean, then the whole guitar has had more clear red spray, followed by the clear coats.

The downside is that as the finish on the edges wears, you are going to see bits of white binding appear - but I've got the same issue on my 1965 Gibson acoustic, where the clear lacquer over the top and binding has faded to a deep amber and where the lacquer has worn off the binding, it's a bright white. It's just natural relicing.