You can view the SVG file used to produce the chassis used in the workshop here. It should be rendered at 72 pts/inch - red lines indicate cuts in the material (by e.g. a laser cutter).
The chassis design was produced by
a python script! To run the script, first install the
dependencies in your python 2.7 compatible python environment via
pip install -r requirements.txt, and the run python -m designs.chassis. Most
aspects of the design are parameterized at the start of the file.