They still do. The hood on mine is synthetic but the rest of it is steel and cast iron, just like the 1965 110 sitting next to it. I think the synthetic material the 5075E's hood is made of is sturdier than the 110's fiberglass hood, though.
Regarding regenerations, mine did this at exactly 100.0 hours. A light on the instrument panel turned on and the exhaust smell changed to smell like a combination of curing paint and a diesel engine running rich. There was no smoke or anything. I kept doing what I was already doing and the light went off after about 15 minutes and that was it.