For this model I decided to begin by making 3 sketches. One of the bunk, one of the porch, and one of the two together. I went off of a drawing Beth had made but I just added the dimensions physically on the paper.
When creating I decided to only draw on the top plane and make upward extrusions from there since that seemed easiest. I began with a base that acted as the floor that would be the full dimensions for the bunk and porch.
I then drew the walls. I made a second box by dimensioning them .15mm from the original line of the floor. I then closed it by tracing over the original box and extruded it 8mm upwards to give the wall some height.
Finally, I made sure the origin was in the bottom left corner so the orientation was correct. In the top left corner I drew two perpendicular line measuring from the base. Then I added two more lines parallel to those and dimensioned them .15mm from the previous lines added to add thickness. To finish I closed the lines and extruded 8mm upwards once again.
Photos of my plans:
Picture of my model:
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