What are you expecting from a neck-through design?
If it's greater sustain you're after, I'm not convinced that neck-through lives up to the hype. I own a Carvin, and it's a wonderful guitar. I'm just not convinced a neck-through design really provides greater sustain characteristics. Sure, it seems like it should make a difference, but whether it does make a difference is open to debate.
I'm pretty sure there are those here that would argue that a bolt-on neck will have similar sustain qualities to a glue-in or neck-through design. I'm also pretty sure there's never been any real research comparing the different construction methods of electric guitars. If there has been, I want to know about it.
I'm also not convinced that SD pickups are the be-all and end-all of pickups. Not that they're horrible, but there are a lot of pickup makers these days. Not all of them have the Seymour Duncan reputation, but I bet there are some as good or even better for less money. Plus, I hate having the pickup makers name so visible right on the pickup. It's like having the auto dealers decal on your car. It doesn't necessarily ensure quality and it's advertising for someone else that you have to pay for.
Of course, there will always be those who believe the hype and be duly impressed by the fact you've got Duncans on your guitar, like they're some sort of super-magical component that makes your guitar better than everyone who doesn't have them. Pay more for the name if you want to impress the yokels, but there will always be people who aren't taken in by a Big Name. Carvin makes excellent pickups, and they have twice the polepieces of other humbuckers, so there is no sound drop-off as the string vibrates or you bend the string. (Like that really happens?)
My point being: question the basic premises of why you want neck-through and SD pups. If you have valid reasons, then go for it. But Warmoth is probably not going to be able to fulfill your desires. If you really have to have a factory finished, neck-through electric, Carvin is the way to go. Try to find one that's already made and swap out the pickups with the Seymours. It's not that hard. But you'll need new pickup rings since Carvin uses a method of two adjustment screws on one side of the ring and one on the other. Rings are cheap.
