Wow! Well that’s a unique way to go. Totally challenging and will reveal all sorts about your slap technique, I’m sure. Did you do the slow and medium tempo exercises as well? I imagine slapping to the really slow & simple stuff would let you hear precisely what control you have.
Which one is that? The one in the slap vid, presumably. I can’t make out what it is, but clearly a ‘stingray’ of some sort. No doubt you’ll share a pic of yours in the Show Us Your Basses (Part 1) thread. 