They had a competition system on there that's why it was rough. they actually have a counter measure for the bouncing in the form of Accumulators which simulate shock absorbers.
This castable prototypes alone run into the 50$ range sometimes i buy low but have to put work to prepare them for casting lowest i could make mine was 20$ a set in resin and hes doing aluminum barrels i wouldnt mind flipping 30$ for a set of those vectors
Sand blaster loaded with table salt, 3m red pad and filler primer. you will have to heavily modify the sandblaster to shoot salt or get a rock tumbler fill it with salt
If anything its gonna cut my prep time into smoothing them, but im not going to be impressed until i try it i got a technique that only takes 20 minutes to smooth models into mold worthy ones.