I'm contemplating building a jazzmaster from used parts, and I was wondering how difficult it would be to install p90s on a standard body- would there be any routing required?
also, if I just bought a body from Warmoth, would it work with standard jazzmaster parts?
I'm pretty sure that jazzmasters come with P-90's as stock.

The routing looks like the right size on the Jagmaster bodies warmoth sell.

Apparently they have various routing options available, so it shouldn't be hard to find one that's P90 compatible.
im pretty sure that Jazzmaster pickups are larger than P90s, I dont have a P90 guitar on hand to check but I do have a Jazzmaster and as I said im pretty sure they arent the same size.

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They are different to P90s according to seymour duncan. But they are bigger than p90s I believe.