I planed down about 300 feet of 3" walnut flooring from 3/4" think to slightly less than 5/8. Flooring accumulates grit over time. I've got a planer with a helical cutter head with the little carbide blades, and it was hard on them, but not to the point of rotating them yet. If you have HS blades, plan on sharpening them when you're done.
Also remember to scan for metal. The boards I was planning had aluminum brads, and I did plane 2-3 of them despite my best efforts to root them out. They did not make a dent in the carbide that I could see or feel, but they might in an HS blade.
I'd laminate them in whatever way made the wood look best, if you care about looks.
Richard, that's a lot of Dominos!