Alright, this is my first competition I do here at game-artist!
I started by extruding cylinders.
I used the 'cut faces' tool to add more dimension in to the cylinder.
I duplicated them, and added the cylinders on the sides of the model.
Then I made the roof out of a cube.
I used 'cut faces' tool to add an edge in the middle.
Then I used the vertices in the middle of the object and pulled it up (to make a roof).
I extruded the front of the roof inside.
Then I took a render.
Final Render:
Reference:
