Finished the mounting nuts last night, hopefully mount them on the car this evening.
I've thought about adding some grooves for grip, but I typically like the car to slide around on the stand while jacking things around as opposed to the car fixed to the stand and tipping the stand over. But adding grooves is easy if needed.
I mostly do projects for me these days, a full set would likely be over $200, I'd need to go review material cost and total time.