On an upcoming bass build I am leaning to use a Lace "alumitone" pickup in the neck position. I am leaning more towards using the P-90 sized pickups that Lace puts in their Helix basses, instead of the alumitone bass bars which are bass soapbar sized. I haven't found a good explanation of P-90 rout sizes...is it substantially different from, say, an EMG 35 sized rout? I'm just thinking in case Warmoth wants to upcharge for using a guitar sized pickup rout on a bass, I could potentially do the EMG 35 rout instead if the sizes would be compatible.
