I'm not 100% sure, but I think the pickup routing might be different for P90 pickups depending if they have soapbar covers or Dog Ear ones.
With the soapbar ones need to be routed deeper.
Not such a biggy with a solid body, but if wanting P90's with a ES-1 KIT for instance, it would mean routing the neck tounge, or making it thinner, so the the neck pickup would fit under the strings....I've had to take around 7mm off mine.
But then again, I don't know if you intend to offer that option with semi kits like the ES-1
Apart from that, all options I can think of are covered in the choices give.
I was going to ask for a option to have head stock binding, then remembered that on the vast majority of kits, that is left up to the builder.
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