I have a set of H+Son Formation Faces that I use on the track. It's the same as the SL42, just without a machined side wall.

I built them 32/32 3x rear, and radial front, with a front road hub, and a rear track hub (obviously), sapim cx-rays and brass nipples, and they still come in under 1900g. That is far from light, but still much lighter than many stock wheelsets. I was shooting for a moderately aero, super stiff, and <2000g wheelset for a solid training set and a passable race wheelset in one. Easily the stiffest wheelset I've ever ridden, and they put up with a beating. I wouldn't hesitate to lace them 20/24 and use them on the road.

Oh, they also look pretty badass. H+Son does some of the best metal finishing I've seen on rims.