Hmm, just got the Heljan Crompton 33 004 in DCE livery, and one of the first things I noticed was the slightly flattened appearance to the roof. Having seen these almost every day in my 'yoof' as 33/1s hauling services between Bournemouth and Weymouth, I believe I have a reasonable memory of their appearance (not to mention still seeing them in preservation and on the odd mainline working). And I don't remember the roof being quite that low...
Off course, my memory could be playing tricks on me...