I am planning on making my own version of a wal bass with similar body style and electronics. It will look something like the attached picture but will have a walnut body with a curly maple facing. I researched the secrets of wal electronics and found a preamp and pickup that would be pretty close. The preamp is a ACG EQ 01 I believe and the pickups are Delano MC 5 HE/M2 music man stlye pickups. Wal electronics are filter based and have low pass filters. This is key for their unique sound. The acg preamp I found has exactly that and should be close to the wal. Also the pups in a wal have separate coils for each pole. Those delano music man pups have four separare coils and should work great! So far I have done solidworks models for the neck and body and started mastercam files for the neck and body. Let me know what you guys think!