I doubt he had or has a 28" waist. Maybe a 32 or 33 inch waist. I'd believe that. For comparison, an old American football player, Jim Brown, when he was playing in the 50's and 60's for the Cleveland Browns, had a 32 inch waist at 6'2". He was considered to be about the fittest player in professional American football at the time. Weight lifting was just starting as a training regime then.
You have a good point about space. I wonder if Lomu would have made a really great international number 8. Wasn't that his position in school? His speed and size made him a battering ram on the wing who could also run around and away from tacklers, but when you think about it there's usually been one big player out on the wing for many national sides over the years: David Duckham was a slightly smaller version of Lomu, as was John Kerwin. »
My negative memory of Johan Lomu is that game against France in the RWC of 1999. He was marked by a 12 stone 5'8" wing (was it La Salle?), but his weakness was exploited: kicks behind him that he had a bad time trying to cover.