Before de-pimping: 
Gleaming. One of the best that the Mobgoblins have. It looks like a tank.
Reinforced panelling. Flowater cannister on the side. Small steam engine fitted on the front. 
And it's easy to identify and report back to the Krag Twins. 

After de-pimping:
It looks like a pile of shit. Pete tears bits off the carriage. With the help of some magic, Magpie puts grime on the windows. Rover writes "was me" on the back window.  A wing mirror falls of.  On Cheeky's request they leave the armour intact.
The result: passers-by on the streets of Donlon glanced at it, clocked that it looked like a pile of shit, and moved on.
Mission accomplished.

Exterior:
The driver and one passenger sit outside at the front of the carriage, elevated on a bench seat with the controls ahead of them.
Being outside means no cover bonus, they are fully exposed.
There is a small slat window between the front bench and the interior cabin.

Interior:  
Four seats inside the cabin, arranged two facing two.
The cabin has two doors, each on either side. There is a window in each door that can be opened
•       Velvet cushions on the seats, 'very nicely upholstered'
•       Curtains across the windows that can be pulled for privacy

And for giggles: 
•       A pole that descends from the ceiling when a button is pressed, there are several buttons.
•       Heated seats
•       Various buttons of unknown function, described by Cheeky as potentially including 'defensive weaponry'
•       A cushion with the letter 'I' stitched on it, described as an 'iPad' by Cheeky, who becomes entranced by the stitching.