Ronnie's 5'11" right?
If he is 200 lbs in the picture it's defiantly attainable naturally with a lot of effort put into heavy training.
As for the big arms, anyone who has arms that respond good will tell you that if they really wanted they could make them 20" if they bothered to train them regularly. I rarely train biceps and my arms are a lean 18" around. You big arm genetic people know what I'm talking about