It's interesting that you still seem unsure, several people have been super helpful and commented that this is going to be somewhat dependent on the pickups and electronics. Plenty of Sandberg's and Sadowsky's are chambered, and they are considered to be slap machines. If there are specific specs that you feel are super important to getting your slap-tone (e.g. – pickup placement) then you can spec that in your order to make sure you're getting the specifications that you are looking for.Thank you for sharing your experience. Anyone else out there with thoughts to share on the slap tone of an Elwood L, chambered bodies or passive or active on the Elwood L??
What additional info are you looking for, beyond the responses and the video examples? I'm curious as to the doubt that a chambered jazz shaped bass will serve as a good slapping platform? I slap on ALL of my basses (headed, headless, Maruszczyk, Mensinger, Specter, Warwick, Ibanez, etc. etc...) albeit the sound is a bit different across these, mostly dependent on the pickups, placement and preamps and how I EQ them.
I could be wrong, but I don't think the example I this video is dependent on the body shape.
If you search Youtube for "maruszczyk slap bass" you'll get plenty of examples from random players slapping on the Elwood.