That blimp look like a banshee tent on steroids gone berserk ... 

I think it's got a hernia

I'm hazarding a guess that blimps are marsupial, and that bulge is a distended pouch, but without further reading I don't want to rely on guesswork alone. We don't get many blimps round this way, mostly hot air balloons, and they're migratory.

(Thinks - Posting a picture of Scarlett O'Hara is probably going to take the joke too far).

Only ONE hernia?????

Oh, no... Now it's going to look like I tried to make the blimp thread crash and burn.... 

A Centenary only comes along once every hundred years, and rather than erecting a statue or building a park, the ACT Government RENTED a hot air balloon.

RENTED!

It's not What were they thinking? Its Were they thinking?

It's ugly, people find it offensive, AND IT"S NOT EVEN OURS!

There aren't words for it.

The main problem I find in building this curved bridge / arch is that the pieces are interlocking, and if you don't get it absolutely perfectly right, the whole structure is prone to falling apart like a house of cards, at the slightest provocation.

It's a good bridge / arch, once the pieces are secured, but getting it there can lead to moments of "Why? Why? Why am I doing this??!". I found that out last time I built one.