Engine shed, part 1

I have started to build the engine house, or the engine shed, as the Brits would say. I am building it from scratch, using 0.4 mm plywood and individual pieces of scale lumber. Not the most efficient way of modeling, but I find the tinkering somewhat relaxing and amusing.

Here is what I have done so far.

The wall sections have not yet been glued together. For the time being they are just leaning on each other.