Echo Canyon dj-dj

Much better. Now add cross bracing and guy wires to finish it off.

^^I'd just have the bottom box with a lateral brace.

Such as: http://www.rcdb.com/3231.htm?p=15713

I'd have to agree about the transitions....None of them really seem realistic to me (none of them are even that close to your reference picture). As a side effect of that.....I'm guessing this is loaded with wheel hits?

Yes, I also agree on that.
They look too mathematically perfect, I guess.