Birthday Bus!

What to make as a cake for a 2 year old - it was a choice between a bus or a character of In the Night Garden and I decided to go with the bus.
Here it is:

I know the windows could have been squarer, but having committed to the pipe round the outside and flood inside it method of icing the cake there wasn't much I could do to correct it - plus, the little one was thrilled with it wonky windows and all!